newtx (17may21)

git-svn-id: svn://tug.org/texlive/trunk@59238 c570f23f-e606-0410-a88d-b1316a301751

75 files changed, 678 insertions, 71 deletions

diff --git a/Master/texmf-dist/doc/fonts/newtx/README b/Master/texmf-dist/doc/fonts/newtx/README
index 2673255de74..b25d66fedb0 100644
--- a/Master/texmf-dist/doc/fonts/newtx/README
+++ b/Master/texmf-dist/doc/fonts/newtx/README
@@ -1,10 +1,15 @@
 This package, initially based on txfonts, provides many fixes and enhancements to the txfonts package, splitting it into two separate packages---newtxtext and newtxmath, which may be run independently of one another. It provides scaling, improved metrics, and other options. In particular, newtxmath offers a libertine option which substitutes Linux Libertine (provided with TeXLive and MikTeX) italic and Greek letters for the default Times letters, providing a good match for the Libertine text font, which is heavier than Computer Modern but lighter than Times, and in my experience, looks very sharp and clear on the screen.
 
-Current version: 1.642 2021-03-27
+Current version: 1.65 2021-05-16
 
 This material is subject to the LaTeX Project Public License. See http://www.ctan.org/license/lppl1.3
 for the details of that license.
 
+Changes in version 1.65
+1. Added a new text family, ntxth, to accommodate the theorem font which is available only in regular weight, italic shape. (In previous versions, the theorem font was accessed as the slanted shape, which turned out to be a bad decision on my part.)
+2. Added true slanted shapes and a new option, trueslanted, to newtxtext. If this option is not specified, newtxtext behaves exactly as in the previous version, with \textsl producing italic with upright punctation. If specified, \textsl produces true slanted text. It is strongly recommended to always use this option in order to get the correct behavior of figures in header text made after specifying \pagestyle{headings}. The only cost will be that you cannot use \textsl to invokee the theorem font. The substitute is \textth or, equivalently, \textthit.
+3. Corrected the mismatched sizes of some extended math parentheses. (Thanks Kazuki Maeda.)
+
 Changes in version 1.642
 Corrected \mathscr, whose definition was absent in 1.641.
 
diff --git a/Master/texmf-dist/doc/fonts/newtx/newtxdoc.pdf b/Master/texmf-dist/doc/fonts/newtx/newtxdoc.pdf
index 9316daf0fbe..1580ee055d6 100644
--- a/Master/texmf-dist/doc/fonts/newtx/newtxdoc.pdf
+++ b/Master/texmf-dist/doc/fonts/newtx/newtxdoc.pdf
diff --git a/Master/texmf-dist/doc/fonts/newtx/newtxdoc.tex b/Master/texmf-dist/doc/fonts/newtx/newtxdoc.tex
index de9603b1c3d..e11ca222006 100644
--- a/Master/texmf-dist/doc/fonts/newtx/newtxdoc.tex
+++ b/Master/texmf-dist/doc/fonts/newtx/newtxdoc.tex
@@ -63,7 +63,13 @@ This package is meant to be a replacement for Young Ryu's {\tt txfonts}. It is
 
 Version 1.60 likewise has many additions and changes that are summarized in Appendix 2. Most important is that {\tt newtx} is now able to output a PDF/A-1b compliant pdf using {\tt pdflatex}.
 
-
+Another important change took place in version 1.65, where  {\tt theoremfont} was reimplemented using a new font family, {\tt ntxth} instead of abusing \verb|\textsl|. By default,  users of {\tt theoremfont} will see no change in its functionality, including the use of the macro \verb|\textsl| to output italics with upright punctuation. A new option, {\tt trueslanted}, to {\tt newtxtext} has the following effects:
+\begin{itemize}
+\item
+\verb|\textsl| now outputs slanted text rather than italics with upright punctuation text, but not affecting the usage of the {\tt theoremfont} option to {\tt newtxtext}.
+\item the former behavior of \verb|\textsl| is now available through the new macro \verb|\textth|, \textsc{aka} \verb|\textthit|.
+\item \verb|\pagestyle{headings}| now functions as intended with slanted rather than upright figures in the headers.
+\end{itemize}
 
 This math package works, after possibly replacing its math Roman and Greek letters, with fonts other than Times that are intermediate in weight between Computer Modern and Times. The free font Linux Libertine is one particular target---it is of nearly the same x-height as Computer Modern, but, not being a \emph{modern} font, does not have a high contrast ratio, and so appears  denser than Computer Modern but not as much so as Times. It is meant as a replacement for Times, but  differs from it in many characteristics, more similar to MinionPro than Times, and provides a better range of variants than Times---three weights (regular, semi-bold and bold) rather than just two, and has expert features in all weights: old-style figures, more extensive and more interesting ligatures,  and  small caps. In my opinion, material typeset in Linux Libertine looks better than the corresponding material typeset in Times. This seems especially true on the screen. As of version 1.0, the package also offers support for MinionPro as a math font, but with limitations described in detail below. More recently, an option to provide math support for the \textsf{garamondx} text font package was added. Version 1.55 adds support for the {SticksToo} text fonts, a reworking of the {\tt STIX2} text fonts.
 
@@ -104,6 +110,7 @@ load roman and typewriter text fonts at 95\% of normal size, and the sans serif
 The option \texttt{osf} instructs the text fonts to use old-style figures \oldstylenums{1234567890} rather than the default lining figures $1234567890$. As of version $1.23$, {\tt newtxtext} loads initially with lining figures so the math package uses lining figures in math mode. The option {\tt osf} changes the default to old-style figures in text at the very end of the preamble, forcing the use of old-style figures in text, but not math. In earlier versions, it was necessary to run 
 \verb|\useosf| after loading {\tt newtxmath}. This is no longer required. 
 
+(New in version $1.65$.) Slanted text is now provided as part of the {\tt newtxtext} package, but requires that you specify the new option {\tt trueslanted}. Without this option, \verb|\textsl| will continue to behave as in earlier versions, outputting italic text with upright punctuation.
 If you use the {\tt babel} package, you should load it before {\tt newtxtext}---for example:
 \begin{verbatim}
 \usepackage[<babel options>]{babel}
@@ -128,6 +135,7 @@ As an example of a {\tt theoremstyle} definition,
 {0pt}   % ABOVESPACE, extra space above
 {0pt}   % BELOWSPACE, extra space below
 {\slshape}  % BODYFONT, italic with upright figures and punctuation
+% Change previous line if using option trueslanted---\thfamily, not \slshape
 {}       % INDENT (empty value is the same as 0pt)
 {\bfseries} % HEADFONT
 {.}         % HEADPUNCT
@@ -171,7 +179,7 @@ Compare this to traditional {\tt plain} theoremstyle with the same text:
 This is Theorem Italic: text numbers are upright---12345; punctuation is in many cases upright (also, parens, braces \{\} and brackets []). What about question marks and exclamations? Also upright! [These fit better with math mode punctuation and figures, like: for all $x\in[0,1]$, let $f(x)\coloneq \exp(\alpha x)$].
 \end{oldthm}
 
-If you are using another theorem package (e.g., ntheorem, theorem) you will have to add your own descriptors as specified in its documentation and set the body font to \verb|\slshape|.
+If you are using another theorem package (e.g., ntheorem, theorem) you will have to add your own descriptors as specified in its documentation and set the body font family to \verb|\thfamily|.
 
 \section{Spacing issues}
 This new version of {\tt newtxtext} has spacing that is a little different, in its default state, from that of the old {\tt newtxtext}. In small part this is due to the finer kerning of TeXGyre Termes, but mostly because the three parameters that govern inter-word spacing are not the same.
@@ -259,13 +267,11 @@ Option {\tt cochf} replaces the default short math italic f with the long italic
 \item
 {\tt cmintegrals} instructs \textsf{newtxmath} to load a thicker version of the Computer Modern integral in place of the \textsf{newtxmath} default---the txfonts integral (identical to the integral in the Wolfram fonts), which is not to everyone's taste---a consequence is that none of the special forms of \textsf{txfonts} integrals are available;
 \textbf{as of version 1.5, this option does nothing, as the new default is slanted integrals.}
-\item the combination
-\begin{verbatim}
+\item 
 % The next line is no longer needed, as newtxmath Requires it
 %\usepackage{amsmath}% loads amstext, amsbsy, amsopn but not amssymb
-\usepackage{newtxmath}
-\end{verbatim}
-causes no error, unlike the same combination with {\tt txfonts}, but does nothing significant. (Recall that {\tt amsmath} is loaded automatically if you use an \textsc{ams} document class such as {\tt amsart} or {\tt amsbook}, as is {\tt amsthm}.) 
+\verb|\usepackage{newtxmath}|
+requires  {\tt amsmath}---there is no need to load it separately.
 %On the other hand,
 %\begin{verbatim}
 %%\usepackage{amsmath} % no longer needed
diff --git a/Master/texmf-dist/fonts/afm/public/newtx/txexs.afm b/Master/texmf-dist/fonts/afm/public/newtx/txexs.afm
index 1a6514b3208..eae73f4e1bf 100644
--- a/Master/texmf-dist/fonts/afm/public/newtx/txexs.afm
+++ b/Master/texmf-dist/fonts/afm/public/newtx/txexs.afm
@@ -1,6 +1,6 @@
 StartFontMetrics 2.0
-Comment Generated by FontForge 20150526
-Comment Creation Date: Mon Aug  8 17:21:11 2016
+Comment Generated by FontForge 20200314
+Comment Creation Date: Mon May 10 13:44:54 2021
 FontName txexs
 FullName txexs
 FamilyName txexs
@@ -18,7 +18,7 @@ C 0 ; WX 293 ; N parenleftbig ; B 50 -1069 263 56 ;
 C 1 ; WX 293 ; N parenrightbig ; B 30 -1069 243 56 ;
 C 2 ; WX 333 ; N bracketleftbig ; B 88 -1144 299 56 ;
 C 3 ; WX 333 ; N bracketrightbig ; B 34 -1144 245 56 ;
-C 4 ; WX 371 ; N floorleftbig ; B 88 -1144 337 56 ;
+C 4 ; WX 371 ; N floorleftbig ; B 88 -1156 337 56 ;
 C 5 ; WX 371 ; N floorrightbig ; B 34 -1144 283 56 ;
 C 6 ; WX 371 ; N ceilingleftbig ; B 88 -1144 337 56 ;
 C 7 ; WX 371 ; N ceilingrightbig ; B 34 -1144 283 56 ;
@@ -62,7 +62,7 @@ C 44 ; WX 659 ; N slashBigg ; B 60 -2944 599 56 ;
 C 45 ; WX 659 ; N backslashBigg ; B 60 -2944 599 56 ;
 C 46 ; WX 567 ; N slashBig ; B 62 -1744 505 56 ;
 C 47 ; WX 567 ; N backslashBig ; B 62 -1744 505 56 ;
-C 48 ; WX 400 ; N parenlefttp ; B 50 -1220 370 6 ;
+C 48 ; WX 400 ; N parenlefttp ; B 50 -1220 370 0 ;
 C 49 ; WX 400 ; N parenrighttp ; B 30 -1220 350 0 ;
 C 50 ; WX 363 ; N bracketlefttp ; B 88 -22 329 600 ;
 C 51 ; WX 363 ; N bracketrighttp ; B 34 -22 275 600 ;
@@ -78,8 +78,8 @@ C 60 ; WX 552 ; N braceleftmid ; B 58 -1220 321 20 ;
 C 61 ; WX 552 ; N bracerightmid ; B 231 -1220 494 20 ;
 C 62 ; WX 552 ; N braceex ; B 231 -20 321 320 ;
 C 63 ; WX 533 ; N arrowvertex ; B 240 -20 292 620 ;
-C 64 ; WX 400 ; N parenleftbt ; B 30 -1202 350 20 ;
-C 65 ; WX 400 ; N parenrightbt ; B 50 -1200 370 26 ;
+C 64 ; WX 400 ; N parenleftbt ; B 30 -1220 350 0 ;
+C 65 ; WX 400 ; N parenrightbt ; B 50 -1220 370 0 ;
 C 66 ; WX 400 ; N parenleftex ; B 50 -21 144 625 ;
 C 67 ; WX 400 ; N parenrightex ; B 256 -21 350 625 ;
 C 68 ; WX 418 ; N angbracketleftBig ; B 50 -1744 368 56 ;
@@ -164,9 +164,9 @@ C 156 ; WX 2900 ; N hat6 ; B 0 583 2900 753 ;
 C 157 ; WX 1900 ; N tilde4 ; B 17 640 1884 763 ;
 C 158 ; WX 2400 ; N tilde5 ; B 33 640 2366 763 ;
 C 159 ; WX 2900 ; N tilde6 ; B 49 640 2850 763 ;
-C 169 ; WX 450 ; N parenlefttpA ; B 50 -20 420 1424 ;
-C 170 ; WX 450 ; N parenrighttpA ; B 30 -20 400 1424 ;
-C 171 ; WX 450 ; N parenleftbtA ; B 50 -6 420 1438 ;
+C 169 ; WX 450 ; N parenlefttpA ; B 50 0 420 1444 ;
+C 170 ; WX 450 ; N parenrighttpA ; B 30 0 400 1444 ;
+C 171 ; WX 450 ; N parenleftbtA ; B 50 0 420 1444 ;
 C 172 ; WX 450 ; N parenrightbtA ; B 30 0 400 1444 ;
 C 173 ; WX 450 ; N parenleftexA ; B 50 -21 144 625 ;
 C 174 ; WX 450 ; N parenrightexA ; B 306 -21 400 625 ;
diff --git a/Master/texmf-dist/fonts/afm/public/newtx/ztmfigs-bsl.afm b/Master/texmf-dist/fonts/afm/public/newtx/ztmfigs-bsl.afm
new file mode 100644
index 00000000000..e549e64f8a4
--- /dev/null
+++ b/Master/texmf-dist/fonts/afm/public/newtx/ztmfigs-bsl.afm
@@ -0,0 +1,51 @@
+StartFontMetrics 2.0
+Comment Generated by FontForge 20200314
+Comment Creation Date: Fri May  7 11:37:16 2021
+FontName ztmfigs-boldslanted
+FullName ztmfigs bold slanted
+FamilyName ztmfigs
+Weight Bold
+Notice (Copyright 2006, 2009 for TeX Gyre extensions by B. Jackowski and J.M. Nowacki (on behalf of TeX users groups). This work is released under the GUST Font License --  see http://tug.org/fonts/licenses/G)
+Comment UST-FONT-LICENSE.txt for details.
+Comment 
+Comment Copyright (c) 2021 Michael Sharpe, released under the equivalent LPPL license. 
+ItalicAngle -15
+IsFixedPitch false
+UnderlinePosition -100
+UnderlineThickness 50
+Version 001.000
+EncodingScheme FontSpecific
+FontBBox -28 -221 673 688
+StartCharMetrics 30
+C 0 ; WX 540 ; N zero.prop ; B 113 -13 607 688 ;
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+C 7 ; WX 504 ; N seven.prop ; B 144 0 663 676 ;
+C 8 ; WX 532 ; N eight.prop ; B 80 -13 625 688 ;
+C 9 ; WX 535 ; N nine.prop ; B 46 -13 614 688 ;
+C 16 ; WX 540 ; N zero.oldstyle ; B 96 -20 570 481 ;
+C 17 ; WX 465 ; N one.oldstyle ; B 46 0 442 481 ;
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+C 41 ; WX 500 ; N nine.taboldstyle ; B -28 -220 541 481 ;
+EndCharMetrics
+EndFontMetrics
diff --git a/Master/texmf-dist/fonts/afm/public/newtx/ztmfigs-sl.afm b/Master/texmf-dist/fonts/afm/public/newtx/ztmfigs-sl.afm
new file mode 100644
index 00000000000..db3432a5154
--- /dev/null
+++ b/Master/texmf-dist/fonts/afm/public/newtx/ztmfigs-sl.afm
@@ -0,0 +1,51 @@
+StartFontMetrics 2.0
+Comment Generated by FontForge 20200314
+Comment Creation Date: Fri May  7 11:32:25 2021
+FontName ztmfigs-slanted
+FullName ztmfigs slanted
+FamilyName ztmfigs
+Weight Regular
+Notice (Copyright 2006, 2009 for TeX Gyre extensions by B. Jackowski and J.M. Nowacki (on behalf of TeX users groups). This work is released under the GUST Font License --  see http://tug.org/fonts/licenses/G)
+Comment UST-FONT-LICENSE.txt for details.
+Comment 
+Comment Copyright (c) 2021 Michael Sharpe, released under the equivalent LPPL license. 
+ItalicAngle -15
+IsFixedPitch false
+UnderlinePosition -100
+UnderlineThickness 50
+Version 001.000
+EncodingScheme FontSpecific
+FontBBox -56 -232 635 688
+StartCharMetrics 30
+C 0 ; WX 552 ; N zero.prop ; B 117 -14 610 676 ;
+C 1 ; WX 328 ; N one.prop ; B 27 0 389 676 ;
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+C 5 ; WX 522 ; N five.prop ; B 51 -14 628 688 ;
+C 6 ; WX 522 ; N six.prop ; B 99 -14 635 684 ;
+C 7 ; WX 469 ; N seven.prop ; B 158 -8 626 662 ;
+C 8 ; WX 502 ; N eight.prop ; B 74 -14 556 676 ;
+C 9 ; WX 517 ; N nine.prop ; B 63 -22 590 676 ;
+C 16 ; WX 532 ; N zero.oldstyle ; B 87 -20 563 470 ;
+C 17 ; WX 363 ; N one.oldstyle ; B 37 0 344 471 ;
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diff --git a/Master/texmf-dist/fonts/map/dvips/newtx/newtx.map b/Master/texmf-dist/fonts/map/dvips/newtx/newtx.map
index 7369d526ad6..3ac09907d79 100644
--- a/Master/texmf-dist/fonts/map/dvips/newtx/newtx.map
+++ b/Master/texmf-dist/fonts/map/dvips/newtx/newtx.map
@@ -255,12 +255,26 @@ ntx-Regular-tlf-scl-t1 ntxtmr " encntx-ec-tlf-sc ReEncodeFont " <[ntx-ec-tlf-sc.
 ntx-Regular-tosf-scl-ly1 ntxtmr " encntx-texnansi-tosf-sc ReEncodeFont " <[ntx-texnansi-tosf-sc.enc <ntxtmr.pfb
 ntx-Regular-tosf-scl-ot1 ntxtmr " encntx-ot1-tosf-sc ReEncodeFont " <[ntx-ot1-tosf-sc.enc <ntxtmr.pfb
 ntx-Regular-tosf-scl-t1 ntxtmr " encntx-ec-tosf-sc ReEncodeFont " <[ntx-ec-tosf-sc.enc <ntxtmr.pfb
-ntx-Italic-tlf-th-t1 ntxtmri " encntx-ecth-tlf ReEncodeFont " <[ntx-ecth-tlf.enc <ntxtmri.pfb
-ntx-Italic-osf-th-t1 ntxtmri " encntx-ecth-osf ReEncodeFont " <[ntx-ecth-osf.enc <ntxtmri.pfb
-ntx-Italic-tlf-th-ot1 ntxtmri " encntx-ot1-th-tlf ReEncodeFont " <[ntx-ot1-th-tlf.enc <ntxtmri.pfb
-ntx-Italic-osf-th-ot1 ntxtmri " encntx-ot1-th-osf ReEncodeFont " <[ntx-ot1-th-osf.enc <ntxtmri.pfb
-ntx-Italic-tlf-th-ly1 ntxtmri " encntx-texnansi-th-tlf ReEncodeFont " <[ntx-texnansi-th-tlf.enc <ntxtmri.pfb
-ntx-Italic-osf-th-ly1 ntxtmri " encntx-texnansi-th-osf ReEncodeFont " <[ntx-texnansi-th-osf.enc <ntxtmri.pfb
+ntxth-Italic-tlf-t1 ntxtmri " encntx-ecth-tlf ReEncodeFont " <[ntx-ecth-tlf.enc <ntxtmri.pfb
+ntxth-Italic-osf-t1 ntxtmri " encntx-ecth-osf ReEncodeFont " <[ntx-ecth-osf.enc <ntxtmri.pfb
+ntxth-Italic-tlf-ot1 ntxtmri " encntx-ot1-th-tlf ReEncodeFont " <[ntx-ot1-th-tlf.enc <ntxtmri.pfb
+ntxth-Italic-osf-ot1 ntxtmri " encntx-ot1-th-osf ReEncodeFont " <[ntx-ot1-th-osf.enc <ntxtmri.pfb
+ntxth-Italic-tlf-ly1 ntxtmri " encntx-texnansi-th-tlf ReEncodeFont " <[ntx-texnansi-th-tlf.enc <ntxtmri.pfb
+ntxth-Italic-osf-ly1 ntxtmri " encntx-texnansi-th-osf ReEncodeFont " <[ntx-texnansi-th-osf.enc <ntxtmri.pfb
+ztmfigs-sl ztmfigs-slanted <ztmfigs-sl.pfb
+ztmfigs-bsl ztmfigs-boldslanted <ztmfigs-bsl.pfb
+ztmbsl-tlf-t1 TeXGyreTermesX-Bold " .167 SlantFont encntx-ec-tlf ReEncodeFont " <ntx-ec-tlf.enc <ztmb.pfb
+ztmbsl-lf-t1 TeXGyreTermesX-Bold " .167 SlantFont encntx-ec-lf ReEncodeFont " <ntx-ec-lf.enc <ztmb.pfb
+ztmbsl-osf-t1 TeXGyreTermesX-Bold " .167 SlantFont encntx-ec-osf ReEncodeFont " <ntx-ec-osf.enc <ztmb.pfb
+ztmbsl-tosf-t1 TeXGyreTermesX-Bold " .167 SlantFont encntx-ec-tosf ReEncodeFont " <ntx-ec-tosf.enc <ztmb.pfb
+ztmbsl-tlf-ot1 TeXGyreTermesX-Bold " .167 SlantFont encntx-ot1-tlf ReEncodeFont " <ntx-ot1-tlf.enc <ztmb.pfb
+ztmbsl-lf-ot1 TeXGyreTermesX-Bold " .167 SlantFont encntx-ot1-lf ReEncodeFont " <ntx-ot1-lf.enc <ztmb.pfb
+ztmbsl-osf-ot1 TeXGyreTermesX-Bold " .167 SlantFont encntx-ot1-osf ReEncodeFont " <ntx-ot1-osf.enc <ztmb.pfb
+ztmbsl-tosf-ot1 TeXGyreTermesX-Bold " .167 SlantFont encntx-ot1-tosf ReEncodeFont " <ntx-ot1-tosf.enc <ztmb.pfb
+ztmbsl-tlf-texnansi TeXGyreTermesX-Bold " .167 SlantFont encntx-texnansi-tlf ReEncodeFont " <ntx-texnansi-tlf.enc <ztmb.pfb
+ztmbsl-lf-texnansi TeXGyreTermesX-Bold " .167 SlantFont encntx-texnansi-lf ReEncodeFont " <ntx-texnansi-lf.enc <ztmb.pfb
+ztmbsl-osf-texnansi TeXGyreTermesX-Bold " .167 SlantFont encntx-texnansi-osf ReEncodeFont " <ntx-texnansi-osf.enc <ztmb.pfb
+ztmbsl-tosf-texnansi TeXGyreTermesX-Bold " .167 SlantFont encntx-texnansi-tosf ReEncodeFont " <ntx-texnansi-tosf.enc <ztmb.pfb
 NewTXMI NewTXMI <NewTXMI.pfb
 NewTXMI7 NewTXMI7 <NewTXMI7.pfb
 NewTXMI5 NewTXMI5 <NewTXMI5.pfb
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ly1xsl-lf.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ly1xsl-lf.tfm
new file mode 100644
index 00000000000..58ec5d58ebb
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ly1xsl-lf.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ly1xsl-osf.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ly1xsl-osf.tfm
new file mode 100644
index 00000000000..bec6e381cd3
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ly1xsl-osf.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ly1xsl-tosf.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ly1xsl-tosf.tfm
new file mode 100644
index 00000000000..31b90207163
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ly1xsl-tosf.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ntxexx.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ntxexx.tfm
index 3aff61cdf67..34008c4fa17 100644
--- a/Master/texmf-dist/fonts/tfm/public/newtx/ntxexx.tfm
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ntxexx.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ntx-Italic-osf-th-ly1.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ntxth-Italic-osf-ly1.tfm
index 0fb49a1eddb..41ea20201f1 100644
--- a/Master/texmf-dist/fonts/tfm/public/newtx/ntx-Italic-osf-th-ly1.tfm
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ntxth-Italic-osf-ly1.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ntx-Italic-osf-th-ot1.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ntxth-Italic-osf-ot1.tfm
index 4f5a2baa943..e7c1f47456c 100644
--- a/Master/texmf-dist/fonts/tfm/public/newtx/ntx-Italic-osf-th-ot1.tfm
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ntxth-Italic-osf-ot1.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ntx-Italic-osf-th-t1.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ntxth-Italic-osf-t1.tfm
index f38f3cfc5ce..b43469822a0 100644
--- a/Master/texmf-dist/fonts/tfm/public/newtx/ntx-Italic-osf-th-t1.tfm
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ntxth-Italic-osf-t1.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ntx-Italic-tlf-th-ly1.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ntxth-Italic-tlf-ly1.tfm
index e1f9c37cd66..93230fbb7c7 100644
--- a/Master/texmf-dist/fonts/tfm/public/newtx/ntx-Italic-tlf-th-ly1.tfm
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ntxth-Italic-tlf-ly1.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ntx-Italic-tlf-th-ot1.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ntxth-Italic-tlf-ot1.tfm
index fe3af694ede..27a5524b08c 100644
--- a/Master/texmf-dist/fonts/tfm/public/newtx/ntx-Italic-tlf-th-ot1.tfm
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ntxth-Italic-tlf-ot1.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ntx-Italic-tlf-th-t1.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ntxth-Italic-tlf-t1.tfm
index e11f5737721..04b4f32ea47 100644
--- a/Master/texmf-dist/fonts/tfm/public/newtx/ntx-Italic-tlf-th-t1.tfm
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ntxth-Italic-tlf-t1.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ot1xsl-lf.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ot1xsl-lf.tfm
new file mode 100644
index 00000000000..29878871695
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ot1xsl-lf.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ot1xsl-osf.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ot1xsl-osf.tfm
new file mode 100644
index 00000000000..a9513b17a39
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ot1xsl-osf.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ot1xsl-tosf.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ot1xsl-tosf.tfm
new file mode 100644
index 00000000000..d3244c6e80a
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ot1xsl-tosf.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/t1xsl-lf.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/t1xsl-lf.tfm
new file mode 100644
index 00000000000..fb680e9a141
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/t1xsl-lf.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/t1xsl-osf.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/t1xsl-osf.tfm
new file mode 100644
index 00000000000..6598a35e892
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/t1xsl-osf.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/t1xsl-tosf.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/t1xsl-tosf.tfm
new file mode 100644
index 00000000000..dd3dded441a
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/t1xsl-tosf.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/txexs.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/txexs.tfm
index f42d1dbf988..94d00d13ee8 100644
--- a/Master/texmf-dist/fonts/tfm/public/newtx/txexs.tfm
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/txexs.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-lf-ot1.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-lf-ot1.tfm
new file mode 100644
index 00000000000..934b95710ee
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-lf-ot1.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-lf-t1.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-lf-t1.tfm
new file mode 100644
index 00000000000..6a394b21218
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-lf-t1.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-lf-texnansi.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-lf-texnansi.tfm
new file mode 100644
index 00000000000..facba609cea
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-lf-texnansi.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-osf-ot1.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-osf-ot1.tfm
new file mode 100644
index 00000000000..59bc169c45d
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-osf-ot1.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-osf-t1.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-osf-t1.tfm
new file mode 100644
index 00000000000..89e6448d5b5
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-osf-t1.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-osf-texnansi.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-osf-texnansi.tfm
new file mode 100644
index 00000000000..0f340795701
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-osf-texnansi.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-tlf-ot1.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-tlf-ot1.tfm
new file mode 100644
index 00000000000..2c2b0c01aff
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-tlf-ot1.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-tlf-t1.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-tlf-t1.tfm
new file mode 100644
index 00000000000..91b26fed31b
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-tlf-t1.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-tlf-texnansi.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-tlf-texnansi.tfm
new file mode 100644
index 00000000000..a1146e9f18a
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-tlf-texnansi.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-tosf-ot1.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-tosf-ot1.tfm
new file mode 100644
index 00000000000..fc76f1c9ee7
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-tosf-ot1.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-tosf-t1.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-tosf-t1.tfm
new file mode 100644
index 00000000000..cf47fb9c33b
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-tosf-t1.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-tosf-texnansi.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-tosf-texnansi.tfm
new file mode 100644
index 00000000000..bd8ca011105
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ztmbsl-tosf-texnansi.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ztmfigs-bsl.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ztmfigs-bsl.tfm
new file mode 100644
index 00000000000..cdbe3099ced
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ztmfigs-bsl.tfm
diff --git a/Master/texmf-dist/fonts/tfm/public/newtx/ztmfigs-sl.tfm b/Master/texmf-dist/fonts/tfm/public/newtx/ztmfigs-sl.tfm
new file mode 100644
index 00000000000..ca12512fdee
--- /dev/null
+++ b/Master/texmf-dist/fonts/tfm/public/newtx/ztmfigs-sl.tfm
diff --git a/Master/texmf-dist/fonts/type1/public/newtx/txexs.pfb b/Master/texmf-dist/fonts/type1/public/newtx/txexs.pfb
index ca5fd341ce0..21c6b320d4f 100644
--- a/Master/texmf-dist/fonts/type1/public/newtx/txexs.pfb
+++ b/Master/texmf-dist/fonts/type1/public/newtx/txexs.pfb
diff --git a/Master/texmf-dist/fonts/type1/public/newtx/ztmfigs-bsl.pfb b/Master/texmf-dist/fonts/type1/public/newtx/ztmfigs-bsl.pfb
new file mode 100644
index 00000000000..08410d1d1a2
--- /dev/null
+++ b/Master/texmf-dist/fonts/type1/public/newtx/ztmfigs-bsl.pfb
diff --git a/Master/texmf-dist/fonts/type1/public/newtx/ztmfigs-sl.pfb b/Master/texmf-dist/fonts/type1/public/newtx/ztmfigs-sl.pfb
new file mode 100644
index 00000000000..fcd319d7639
--- /dev/null
+++ b/Master/texmf-dist/fonts/type1/public/newtx/ztmfigs-sl.pfb
diff --git a/Master/texmf-dist/fonts/vf/public/newtx/ly1xsl-lf.vf b/Master/texmf-dist/fonts/vf/public/newtx/ly1xsl-lf.vf
new file mode 100644
index 00000000000..1d450960f3d
--- /dev/null
+++ b/Master/texmf-dist/fonts/vf/public/newtx/ly1xsl-lf.vf
diff --git a/Master/texmf-dist/fonts/vf/public/newtx/ly1xsl-osf.vf b/Master/texmf-dist/fonts/vf/public/newtx/ly1xsl-osf.vf
new file mode 100644
index 00000000000..666576f35d8
--- /dev/null
+++ b/Master/texmf-dist/fonts/vf/public/newtx/ly1xsl-osf.vf
diff --git a/Master/texmf-dist/fonts/vf/public/newtx/ly1xsl-tosf.vf b/Master/texmf-dist/fonts/vf/public/newtx/ly1xsl-tosf.vf
new file mode 100644
index 00000000000..4c1f1534cf2
--- /dev/null
+++ b/Master/texmf-dist/fonts/vf/public/newtx/ly1xsl-tosf.vf
diff --git a/Master/texmf-dist/fonts/vf/public/newtx/ot1xsl-lf.vf b/Master/texmf-dist/fonts/vf/public/newtx/ot1xsl-lf.vf
new file mode 100644
index 00000000000..b7c08ace922
--- /dev/null
+++ b/Master/texmf-dist/fonts/vf/public/newtx/ot1xsl-lf.vf
diff --git a/Master/texmf-dist/fonts/vf/public/newtx/ot1xsl-osf.vf b/Master/texmf-dist/fonts/vf/public/newtx/ot1xsl-osf.vf
new file mode 100644
index 00000000000..6ac888e35aa
--- /dev/null
+++ b/Master/texmf-dist/fonts/vf/public/newtx/ot1xsl-osf.vf
diff --git a/Master/texmf-dist/fonts/vf/public/newtx/ot1xsl-tosf.vf b/Master/texmf-dist/fonts/vf/public/newtx/ot1xsl-tosf.vf
new file mode 100644
index 00000000000..3d58c851e4e
--- /dev/null
+++ b/Master/texmf-dist/fonts/vf/public/newtx/ot1xsl-tosf.vf
diff --git a/Master/texmf-dist/fonts/vf/public/newtx/t1xsl-lf.vf b/Master/texmf-dist/fonts/vf/public/newtx/t1xsl-lf.vf
new file mode 100644
index 00000000000..2ed8b5e2426
--- /dev/null
+++ b/Master/texmf-dist/fonts/vf/public/newtx/t1xsl-lf.vf
diff --git a/Master/texmf-dist/fonts/vf/public/newtx/t1xsl-osf.vf b/Master/texmf-dist/fonts/vf/public/newtx/t1xsl-osf.vf
new file mode 100644
index 00000000000..2b9f702e39d
--- /dev/null
+++ b/Master/texmf-dist/fonts/vf/public/newtx/t1xsl-osf.vf
diff --git a/Master/texmf-dist/fonts/vf/public/newtx/t1xsl-tosf.vf b/Master/texmf-dist/fonts/vf/public/newtx/t1xsl-tosf.vf
new file mode 100644
index 00000000000..8035ebcfc6c
--- /dev/null
+++ b/Master/texmf-dist/fonts/vf/public/newtx/t1xsl-tosf.vf
diff --git a/Master/texmf-dist/tex/latex/newtx/ly1ntxlf.fd b/Master/texmf-dist/tex/latex/newtx/ly1ntxlf.fd
index d3395d04c3b..6598756cec7 100644
--- a/Master/texmf-dist/tex/latex/newtx/ly1ntxlf.fd
+++ b/Master/texmf-dist/tex/latex/newtx/ly1ntxlf.fd
@@ -1,4 +1,8 @@
-\ProvidesFile{ly1ntxlf.fd}[2015/01/17 v1.0 font definition file for LY1/ntx/lf]
+\ProvidesFile{ly1ntxlf.fd}[2021/05/08 v1.0 font definition file for LY1/ntx/lf]
+
+\expandafter\ifx\csname ntx@sltrue\endcsname\relax
+  \global\newif\ntx@sl\global\ntx@sltrue%
+\fi
 
 \expandafter\ifx\csname ntx@scaled\endcsname\relax
   \let\ntx@scaled\@empty%
@@ -21,9 +25,15 @@
 \DeclareFontShape{LY1}{ntxlf}{bx}{n}{<->ssub * ntxlf/b/n}{}
 \DeclareFontShape{LY1}{ntxlf}{bx}{scit}{<->ssub * ntxlf/b/scit}{}
 \DeclareFontShape{LY1}{ntxlf}{bx}{it}{<->ssub * ntxlf/b/it}{}
-\DeclareFontShape{LY1}{ntxlf}{m}{sl}{<-> \ntx@scaled  ntx-Italic-tlf-th-ly1}{}
-\DeclareFontShape{LY1}{ntxlf}{b}{sl}{<->ssub * ntxlf/m/sl}{}
-\DeclareFontShape{LY1}{ntxlf}{bx}{sl}{<->ssub * ntxlf/m/sl}{}
+\ifntx@sl % point to real slanted fonts
+  \DeclareFontShape{LY1}{ntxlf}{m}{sl}{<-> \ntx@scaled ly1xsl-lf}{}
+  \DeclareFontShape{LY1}{ntxlf}{b}{sl}{<-> \ntx@scaled ztmbsl-lf-ly1}{}
+  \DeclareFontShape{LY1}{ntxlf}{bx}{sl}{<->ssub * ntxlf/b/sl}{}
+\else %point to theorem font
+  \DeclareFontShape{LY1}{ntxlf}{m}{sl}{<-> \ntx@scaled ntxth-Italic-tlf-ot1}{}
+  \DeclareFontShape{LY1}{ntxlf}{b}{sl}{<->ssub * ntxlf/m/sl}{}
+  \DeclareFontShape{LY1}{ntxlf}{bx}{sl}{<->ssub * ntxlf/m/sl}{}
+\fi
 \DeclareFontShape{LY1}{ntxlf}{b}{scsl}{<->ssub * ntxlf/b/scit}{}
 \DeclareFontShape{LY1}{ntxlf}{bx}{scsl}{<->ssub * ntxlf/b/scit}{}
 \DeclareFontShape{LY1}{ntxlf}{m}{scsl}{<->ssub * ntxlf/m/scit}{}
diff --git a/Master/texmf-dist/tex/latex/newtx/ly1ntxosf.fd b/Master/texmf-dist/tex/latex/newtx/ly1ntxosf.fd
index a9026bdd90b..6360501bd7d 100644
--- a/Master/texmf-dist/tex/latex/newtx/ly1ntxosf.fd
+++ b/Master/texmf-dist/tex/latex/newtx/ly1ntxosf.fd
@@ -1,4 +1,8 @@
-\ProvidesFile{ly1ntxosf.fd}[2015/01/17 v1.0 font definition file for LY1/ntx/osf]
+\ProvidesFile{ly1ntxosf.fd}[2021/05/08 v1.0 font definition file for LY1/ntx/osf]
+
+\expandafter\ifx\csname ntx@sltrue\endcsname\relax
+  \global\newif\ntx@sl\global\ntx@sltrue%
+\fi
 
 \expandafter\ifx\csname ntx@scaled\endcsname\relax
   \let\ntx@scaled\@empty%
diff --git a/Master/texmf-dist/tex/latex/newtx/ly1ntxth-lf.fd b/Master/texmf-dist/tex/latex/newtx/ly1ntxth-lf.fd
new file mode 100644
index 00000000000..80aba3a3226
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/newtx/ly1ntxth-lf.fd
@@ -0,0 +1,28 @@
+\ProvidesFile{ly1ntxth-lf.fd}[2021/05/07 v1.0 font definition file for LY1/ntxth/lf]
+
+\expandafter\ifx\csname ntx@scaled\endcsname\relax
+  \let\ntx@scaled\@empty%
+\fi
+
+\ifdefined\ntx@spacing \else\global\let\ntx@spacing\@empty\fi
+%\traceon
+\DeclareFontFamily{LY1}{ntxth-lf}{\ntx@spacing}
+\DeclareFontShape{LY1}{ntxth-lf}{m}{it}{<-> \ntx@scaled ntxth-Italic-tlf-ly1}{}
+\DeclareFontShape{LY1}{ntxth-lf}{m}{n}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-lf}{m}{sc}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-lf}{m}{scit}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-lf}{b}{sc}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-lf}{bx}{sc}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-lf}{b}{n}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-lf}{bx}{n}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-lf}{b}{scit}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-lf}{bx}{scit}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-lf}{b}{it}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-lf}{bx}{it}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-lf}{m}{sl}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-lf}{b}{sl}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-lf}{bx}{sl}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-lf}{b}{scsl}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-lf}{bx}{scsl}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-lf}{m}{scsl}{<->ssub * ntxth-lf/m/it}{}
+\endinput
diff --git a/Master/texmf-dist/tex/latex/newtx/ly1ntxth-osf.fd b/Master/texmf-dist/tex/latex/newtx/ly1ntxth-osf.fd
new file mode 100644
index 00000000000..cbd55d09cbd
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/newtx/ly1ntxth-osf.fd
@@ -0,0 +1,28 @@
+\ProvidesFile{ly1ntxth-osf.fd}[2021/05/07 v1.0 font definition file for LY1/ntxth/osf]
+
+\expandafter\ifx\csname ntx@scaled\endcsname\relax
+  \let\ntx@scaled\@empty%
+\fi
+
+\ifdefined\ntx@spacing \else\global\let\ntx@spacing\@empty\fi
+%\traceon
+\DeclareFontFamily{LY1}{ntxth-osf}{\ntx@spacing}
+\DeclareFontShape{LY1}{ntxth-osf}{m}{it}{<-> \ntx@scaled ntxth-Italic-osf-ly1}{}
+\DeclareFontShape{LY1}{ntxth-osf}{m}{n}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-osf}{m}{sc}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-osf}{m}{scit}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-osf}{b}{sc}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-osf}{bx}{sc}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-osf}{b}{n}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-osf}{bx}{n}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-osf}{b}{scit}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-osf}{bx}{scit}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-osf}{b}{it}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-osf}{bx}{it}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-osf}{m}{sl}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-osf}{b}{sl}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-osf}{bx}{sl}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-osf}{b}{scsl}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-osf}{bx}{scsl}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-osf}{m}{scsl}{<->ssub * ntxth-osf/m/it}{}
+\endinput
diff --git a/Master/texmf-dist/tex/latex/newtx/ly1ntxth-tlf.fd b/Master/texmf-dist/tex/latex/newtx/ly1ntxth-tlf.fd
new file mode 100644
index 00000000000..a14e1073988
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/newtx/ly1ntxth-tlf.fd
@@ -0,0 +1,28 @@
+\ProvidesFile{ly1ntxth-tlf.fd}[2021/05/06 v1.0 font definition file for LY1/ntxth/tlf]
+
+\expandafter\ifx\csname ntx@scaled\endcsname\relax
+  \let\ntx@scaled\@empty%
+\fi
+
+\ifdefined\ntx@spacing \else\global\let\ntx@spacing\@empty\fi
+%\traceon
+\DeclareFontFamily{LY1}{ntxth-tlf}{\ntx@spacing}
+\DeclareFontShape{LY1}{ntxth-tlf}{m}{it}{<-> \ntx@scaled ntxth-Italic-tlf-ly1}{}
+\DeclareFontShape{LY1}{ntxth-tlf}{m}{n}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tlf}{m}{sc}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tlf}{m}{scit}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tlf}{b}{sc}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tlf}{bx}{sc}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tlf}{b}{n}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tlf}{bx}{n}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tlf}{b}{scit}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tlf}{bx}{scit}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tlf}{b}{it}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tlf}{bx}{it}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tlf}{m}{sl}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tlf}{b}{sl}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tlf}{bx}{sl}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tlf}{b}{scsl}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tlf}{bx}{scsl}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tlf}{m}{scsl}{<->ssub * ntxth-tlf/m/it}{}
+\endinput
diff --git a/Master/texmf-dist/tex/latex/newtx/ly1ntxth-tosf.fd b/Master/texmf-dist/tex/latex/newtx/ly1ntxth-tosf.fd
new file mode 100644
index 00000000000..cf298132f44
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/newtx/ly1ntxth-tosf.fd
@@ -0,0 +1,28 @@
+\ProvidesFile{ly1ntxth-tosf.fd}[2021/05/07 v1.0 font definition file for LY1/ntxth/tosf]
+
+\expandafter\ifx\csname ntx@scaled\endcsname\relax
+  \let\ntx@scaled\@empty%
+\fi
+
+\ifdefined\ntx@spacing \else\global\let\ntx@spacing\@empty\fi
+%\traceon
+\DeclareFontFamily{LY1}{ntxth-tosf}{\ntx@spacing}
+\DeclareFontShape{LY1}{ntxth-tosf}{m}{it}{<-> \ntx@scaled ntxth-Italic-osf-ly1}{}
+\DeclareFontShape{LY1}{ntxth-tosf}{m}{n}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tosf}{m}{sc}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tosf}{m}{scit}{<-> ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tosf}{b}{sc}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tosf}{bx}{sc}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tosf}{b}{n}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tosf}{bx}{n}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tosf}{b}{scit}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tosf}{bx}{scit}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tosf}{b}{it}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tosf}{bx}{it}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tosf}{m}{sl}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tosf}{b}{sl}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tosf}{bx}{sl}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tosf}{b}{scsl}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tosf}{bx}{scsl}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{LY1}{ntxth-tosf}{m}{scsl}{<->ssub * ntxth-tosf/m/it}{}
+\endinput
diff --git a/Master/texmf-dist/tex/latex/newtx/ly1ntxtlf.fd b/Master/texmf-dist/tex/latex/newtx/ly1ntxtlf.fd
index 02c7aef37cc..7fd8882ac8d 100644
--- a/Master/texmf-dist/tex/latex/newtx/ly1ntxtlf.fd
+++ b/Master/texmf-dist/tex/latex/newtx/ly1ntxtlf.fd
@@ -1,4 +1,8 @@
-\ProvidesFile{ly1ntxtlf.fd}[2015/01/17 v1.0 font definition file for LY1/ntx/tlf]
+\ProvidesFile{ly1ntxtlf.fd}[2021/05/08 v1.0 font definition file for LY1/ntx/tlf]
+
+\expandafter\ifx\csname ntx@sltrue\endcsname\relax
+  \global\newif\ntx@sl\global\ntx@sltrue%
+\fi
 
 \expandafter\ifx\csname ntx@scaled\endcsname\relax
   \let\ntx@scaled\@empty%
@@ -21,9 +25,15 @@
 \DeclareFontShape{LY1}{ntxtlf}{bx}{n}{<->ssub * ntxtlf/b/n}{}
 \DeclareFontShape{LY1}{ntxtlf}{bx}{scit}{<->ssub * ntxtlf/b/scit}{}
 \DeclareFontShape{LY1}{ntxtlf}{bx}{it}{<->ssub * ntxtlf/b/it}{}
-\DeclareFontShape{LY1}{ntxtlf}{m}{sl}{<-> \ntx@scaled  ntx-Italic-tlf-th-ly1}{}
-\DeclareFontShape{LY1}{ntxtlf}{b}{sl}{<->ssub * ntxtlf/m/sl}{}
-\DeclareFontShape{LY1}{ntxtlf}{bx}{sl}{<->ssub * ntxtlf/m/sl}{}
+\ifntx@sl % point to real slanted fonts
+  \DeclareFontShape{LY1}{ntxtlf}{m}{sl}{<-> \ntx@scaled tyxsl}{}
+  \DeclareFontShape{LY1}{ntxtlf}{b}{sl}{<-> \ntx@scaled ztmbsl-tlf-ly1}{}
+  \DeclareFontShape{LY1}{ntxtlf}{bx}{sl}{<->ssub * ntxtlf/b/sl}{}
+\else %point to theorem font
+  \DeclareFontShape{LY1}{ntxtlf}{m}{sl}{<-> \ntx@scaled ntxth-Italic-tlf-ot1}{}
+  \DeclareFontShape{LY1}{ntxtlf}{b}{sl}{<->ssub * ntxtlf/m/sl}{}
+  \DeclareFontShape{LY1}{ntxtlf}{bx}{sl}{<->ssub * ntxtlf/m/sl}{}
+\fi
 \DeclareFontShape{LY1}{ntxtlf}{b}{scsl}{<->ssub * ntxtlf/b/scit}{}
 \DeclareFontShape{LY1}{ntxtlf}{bx}{scsl}{<->ssub * ntxtlf/b/scit}{}
 \DeclareFontShape{LY1}{ntxtlf}{m}{scsl}{<->ssub * ntxtlf/m/scit}{}
diff --git a/Master/texmf-dist/tex/latex/newtx/ly1ntxtosf.fd b/Master/texmf-dist/tex/latex/newtx/ly1ntxtosf.fd
index 32c7f2fee4c..918953a2ab9 100644
--- a/Master/texmf-dist/tex/latex/newtx/ly1ntxtosf.fd
+++ b/Master/texmf-dist/tex/latex/newtx/ly1ntxtosf.fd
@@ -1,4 +1,8 @@
-\ProvidesFile{ly1ntxtosf.fd}[2015/01/17 v1.0 font definition file for LY1/ntx/tosf]
+\ProvidesFile{ly1ntxtosf.fd}[2021/05/08 v1.0 font definition file for LY1/ntx/tosf]
+
+\expandafter\ifx\csname ntx@sltrue\endcsname\relax
+  \global\newif\ntx@sl\global\ntx@sltrue%
+\fi
 
 \expandafter\ifx\csname ntx@scaled\endcsname\relax
   \let\ntx@scaled\@empty%
@@ -23,9 +27,15 @@
 \DeclareFontShape{LY1}{ntxtosf}{bx}{n}{<->ssub * ntxtosf/b/n}{}
 \DeclareFontShape{LY1}{ntxtosf}{bx}{scit}{<->ssub * ntxtosf/b/scit}{}
 \DeclareFontShape{LY1}{ntxtosf}{bx}{it}{<->ssub * ntxtosf/b/it}{}
-\DeclareFontShape{LY1}{ntxtosf}{m}{sl}{<-> \ntx@scaled  ntx-Italic-osf-th-ly1}{}
-\DeclareFontShape{LY1}{ntxtosf}{b}{sl}{<->ssub * ntxtosf/m/sl}{}
-\DeclareFontShape{LY1}{ntxtosf}{bx}{sl}{<->ssub * ntxtosf/m/sl}{}
+\ifntx@sl % point to real slanted fonts
+  \DeclareFontShape{LY1}{ntxtosf}{m}{sl}{<-> \ntx@scaled ly1xsl-tosf}{}
+  \DeclareFontShape{LY1}{ntxtosf}{b}{sl}{<-> \ntx@scaled ztmbsl-tosf-ly1}{}
+  \DeclareFontShape{LY1}{ntxtosf}{bx}{sl}{<->ssub * ntxtosf/b/sl}{}
+\else %point to theorem font
+  \DeclareFontShape{LY1}{ntxtosf}{m}{sl}{<-> \ntx@scaled ntxth-Italic-tlf-ot1}{}
+  \DeclareFontShape{LY1}{ntxtosf}{b}{sl}{<->ssub * ntxtosf/m/sl}{}
+  \DeclareFontShape{LY1}{ntxtosf}{bx}{sl}{<->ssub * ntxtosf/m/sl}{}
+\fi
 \DeclareFontShape{LY1}{ntxtosf}{b}{scsl}{<->ssub * ntxtosf/b/scit}{}
 \DeclareFontShape{LY1}{ntxtosf}{bx}{scsl}{<->ssub * ntxtosf/b/scit}{}
 \DeclareFontShape{LY1}{ntxtosf}{m}{scsl}{<->ssub * ntxtosf/m/scit}{}
diff --git a/Master/texmf-dist/tex/latex/newtx/newtxtext.sty b/Master/texmf-dist/tex/latex/newtx/newtxtext.sty
index bea71a0617d..719ef139455 100644
--- a/Master/texmf-dist/tex/latex/newtx/newtxtext.sty
+++ b/Master/texmf-dist/tex/latex/newtx/newtxtext.sty
@@ -1,7 +1,7 @@
 \NeedsTeXFormat{LaTeX2e}
 
-\def\fileversion{1.630}
-\def\filedate{2020/09/19}
+\def\fileversion{1.65}
+\def\filedate{2021/05/16}
 \ProvidesPackage{newtxtext}[\filedate\space v\fileversion]
 
 \message{`newtxtext' v\fileversion, \filedate\space Text macros taking advantage of TeX-Gyre Termes fonts (msharpe)}
@@ -20,6 +20,7 @@
 \@onlypreamble\useproportional
 \RequirePackage{etoolbox}
 
+\def\ntx@dfltfigurestyle{lf}
 \def\ntx@figurestyle{lf}% default is lining figure style
 \def\ntx@figurealign{t}% default is tabular figure alignment
 \newif\ifntx@defaultsups
@@ -41,6 +42,8 @@
 \define@key{ntx}{babel}[true]{\relax}% keep, though no effect
 %\csname ntx@babel#1\endcsname}
 \newif\ifntx@thrm
+\newif\ifntx@sl % slanted means theoremfont, by default
+% If set to true, slanted really does mean true slanted
 \define@key{ntx}{helvratio}[0.9]{\def\ntx@helvratio{#1}}
 \define@key{ntx}{scaled}[1.0]{\def\ntx@scaled{s*[#1]}%
 \def\ntx@scale{#1}\def\LGCscale{#1}}
@@ -60,6 +63,7 @@
 \DeclareOption{lining}{\edef\ntx@figurestyle{lf}}
 \DeclareOption{lf}{\edef\ntx@figurestyle{lf}}
 \DeclareOption{theoremfont}{\ntx@thrmtrue}
+\DeclareOption{trueslanted}{\ntx@sltrue}
 \DeclareOption{oldstyle}{\useosf}
 \DeclareOption{osf}{\useosf}
 \DeclareOption{tabular}{\edef\ntx@figurealign{t}}
@@ -344,9 +348,29 @@
 %	\ntx@figurestyle}
 %	\normalfont
 %\else
-    \AtEndPreamble{%
+
+\DeclareRobustCommand\thfamily % new family for theorem font
+        {\not@math@alphabet\thfamily\relax
+         \fontfamily\thdefault\selectfont}
+\DeclareRobustCommand{\textth}[1]{%
+  {\thfamily #1}%
+}
+\let\textthit\textth
+
+\AtEndPreamble{%
 \renewcommand*{\rmdefault}{ntx\ntx@figurealign%
 \ntx@figurestyle}
+\def\ntx@thfigurestyle{\ntx@figurestyle}
+\ifx\ntx@figurestyle\ntx@dfltfigurestyle
+  \def\ntx@thfigurestyle{tlf}
+\else
+  \def\ntx@thfigurestyle{osf}
+\fi % there just two possible figure styles for the theorem font
+\newcommand*{\thdefault}{ntxth-\ntx@thfigurestyle}
+\ifntx@thrm
+    \theoremstyle{plain}
+    \patchcmd{\th@plain}{\itshape}{\thfamily}{\message{Replaced itshape by thfamily in theorem style plain.}}{\message{Unable to replace itshape by thfamily in theorem style plain.}}
+\fi
 \normalfont}
 %\fi
 
diff --git a/Master/texmf-dist/tex/latex/newtx/ot1ntxlf.fd b/Master/texmf-dist/tex/latex/newtx/ot1ntxlf.fd
index 215a44ed6d7..e685017088e 100644
--- a/Master/texmf-dist/tex/latex/newtx/ot1ntxlf.fd
+++ b/Master/texmf-dist/tex/latex/newtx/ot1ntxlf.fd
@@ -1,4 +1,8 @@
-\ProvidesFile{ot1ntxlf.fd}[2015/01/19 v1.0 font definition file for OT1/ntx/lf]
+\ProvidesFile{ot1ntxlf.fd}[2021/05/08 v1.0 font definition file for OT1/ntx/lf]
+
+\expandafter\ifx\csname ntx@sltrue\endcsname\relax
+  \global\newif\ntx@sl\global\ntx@sltrue%
+\fi
 
 \expandafter\ifx\csname ntx@scaled\endcsname\relax
   \let\ntx@scaled\@empty%
@@ -21,9 +25,15 @@
 \DeclareFontShape{OT1}{ntxlf}{bx}{n}{<->ssub * ntxlf/b/n}{}
 \DeclareFontShape{OT1}{ntxlf}{bx}{scit}{<->ssub * ntxlf/b/scit}{}
 \DeclareFontShape{OT1}{ntxlf}{bx}{it}{<->ssub * ntxlf/b/it}{}
-\DeclareFontShape{OT1}{ntxlf}{m}{sl}{<-> \ntx@scaled ntx-Italic-tlf-th-ot1}{}
-\DeclareFontShape{OT1}{ntxlf}{b}{sl}{<->ssub * ntxlf/m/sl}{}
-\DeclareFontShape{OT1}{ntxlf}{bx}{sl}{<->ssub * ntxlf/m/sl}{}
+\ifntx@sl % point to real slanted fonts
+  \DeclareFontShape{OT1}{ntxlf}{m}{sl}{<-> \ntx@scaled ot1xsl-lf}{}
+  \DeclareFontShape{OT1}{ntxlf}{b}{sl}{<-> \ntx@scaled ztmbsl-lf-ot1}{}
+  \DeclareFontShape{OT1}{ntxlf}{bx}{sl}{<->ssub * ntxlf/b/sl}{}
+\else %point to theorem font
+  \DeclareFontShape{OT1}{ntxlf}{m}{sl}{<-> \ntx@scaled ntxth-Italic-tlf-ot1}{}
+  \DeclareFontShape{OT1}{ntxlf}{b}{sl}{<->ssub * ntxlf/m/sl}{}
+  \DeclareFontShape{OT1}{ntxlf}{bx}{sl}{<->ssub * ntxlf/m/sl}{}
+\fi
 \DeclareFontShape{OT1}{ntxlf}{b}{scsl}{<->ssub * ntxlf/b/scit}{}
 \DeclareFontShape{OT1}{ntxlf}{bx}{scsl}{<->ssub * ntxlf/b/scit}{}
 \DeclareFontShape{OT1}{ntxlf}{m}{scsl}{<->ssub * ntxlf/m/scit}{}
diff --git a/Master/texmf-dist/tex/latex/newtx/ot1ntxosf.fd b/Master/texmf-dist/tex/latex/newtx/ot1ntxosf.fd
index 3cf89bf7bf4..e52f5b27501 100644
--- a/Master/texmf-dist/tex/latex/newtx/ot1ntxosf.fd
+++ b/Master/texmf-dist/tex/latex/newtx/ot1ntxosf.fd
@@ -1,4 +1,8 @@
-\ProvidesFile{ot1ntxosf.fd}[2015/01/17 v1.0 font definition file for OT1/ntx/osf]
+\ProvidesFile{ot1ntxosf.fd}[2021/05/08 v1.0 font definition file for OT1/ntx/osf]
+
+\expandafter\ifx\csname ntx@sltrue\endcsname\relax
+  \global\newif\ntx@sl\global\ntx@sltrue%
+\fi
 
 \expandafter\ifx\csname ntx@scaled\endcsname\relax
   \let\ntx@scaled\@empty%
@@ -21,9 +25,15 @@
 \DeclareFontShape{OT1}{ntxosf}{bx}{n}{<->ssub * ntxosf/b/n}{}
 \DeclareFontShape{OT1}{ntxosf}{bx}{scit}{<->ssub * ntxosf/b/scit}{}
 \DeclareFontShape{OT1}{ntxosf}{bx}{it}{<->ssub * ntxosf/b/it}{}
-\DeclareFontShape{OT1}{ntxosf}{m}{sl}{<-> \ntx@scaled ntx-Italic-osf-th-ot1}{}
-\DeclareFontShape{OT1}{ntxosf}{b}{sl}{<->ssub * ntxosf/m/sl}{}
-\DeclareFontShape{OT1}{ntxosf}{bx}{sl}{<->ssub * ntxosf/m/sl}{}
+\ifntx@sl % point to real slanted fonts
+  \DeclareFontShape{OT1}{ntxosf}{m}{sl}{<-> \ntx@scaled ot1xsl-osf}{}
+  \DeclareFontShape{OT1}{ntxosf}{b}{sl}{<-> \ntx@scaled ztmbsl-osf-ot1}{}
+  \DeclareFontShape{OT1}{ntxosf}{bx}{sl}{<->ssub * ntxosf/b/sl}{}
+\else %point to theorem font
+  \DeclareFontShape{OT1}{ntxosf}{m}{sl}{<-> \ntx@scaled ntxth-Italic-tlf-ot1}{}
+  \DeclareFontShape{OT1}{ntxosf}{b}{sl}{<->ssub * ntxosf/m/sl}{}
+  \DeclareFontShape{OT1}{ntxosf}{bx}{sl}{<->ssub * ntxosf/m/sl}{}
+\fi
 \DeclareFontShape{OT1}{ntxosf}{b}{scsl}{<->ssub * ntxosf/b/scit}{}
 \DeclareFontShape{OT1}{ntxosf}{bx}{scsl}{<->ssub * ntxosf/b/scit}{}
 \DeclareFontShape{OT1}{ntxosf}{m}{scsl}{<->ssub * ntxosf/m/scit}{}
diff --git a/Master/texmf-dist/tex/latex/newtx/ot1ntxth-lf.fd b/Master/texmf-dist/tex/latex/newtx/ot1ntxth-lf.fd
new file mode 100644
index 00000000000..e88d20a8c95
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/newtx/ot1ntxth-lf.fd
@@ -0,0 +1,28 @@
+\ProvidesFile{ot1ntxth-lf.fd}[2021/05/07 v1.0 font definition file for OT1/ntxth/lf]
+
+\expandafter\ifx\csname ntx@scaled\endcsname\relax
+  \let\ntx@scaled\@empty%
+\fi
+
+\ifdefined\ntx@spacing \else\global\let\ntx@spacing\@empty\fi
+%\traceon
+\DeclareFontFamily{OT1}{ntxth-lf}{\ntx@spacing}
+\DeclareFontShape{OT1}{ntxth-lf}{m}{it}{<-> \ntx@scaled ntxth-Italic-tlf-ot1}{}
+\DeclareFontShape{OT1}{ntxth-lf}{m}{n}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-lf}{m}{sc}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-lf}{m}{scit}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-lf}{b}{sc}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-lf}{bx}{sc}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-lf}{b}{n}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-lf}{bx}{n}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-lf}{b}{scit}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-lf}{bx}{scit}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-lf}{b}{it}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-lf}{bx}{it}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-lf}{m}{sl}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-lf}{b}{sl}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-lf}{bx}{sl}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-lf}{b}{scsl}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-lf}{bx}{scsl}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-lf}{m}{scsl}{<->ssub * ntxth-lf/m/it}{}
+\endinput
diff --git a/Master/texmf-dist/tex/latex/newtx/ot1ntxth-osf.fd b/Master/texmf-dist/tex/latex/newtx/ot1ntxth-osf.fd
new file mode 100644
index 00000000000..62d53017eef
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/newtx/ot1ntxth-osf.fd
@@ -0,0 +1,28 @@
+\ProvidesFile{ot1ntxth-osf.fd}[2021/05/07 v1.0 font definition file for OT1/ntxth/osf]
+
+\expandafter\ifx\csname ntx@scaled\endcsname\relax
+  \let\ntx@scaled\@empty%
+\fi
+
+\ifdefined\ntx@spacing \else\global\let\ntx@spacing\@empty\fi
+%\traceon
+\DeclareFontFamily{OT1}{ntxth-osf}{\ntx@spacing}
+\DeclareFontShape{OT1}{ntxth-osf}{m}{it}{<-> \ntx@scaled ntxth-Italic-osf-ot1}{}
+\DeclareFontShape{OT1}{ntxth-osf}{m}{n}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-osf}{m}{sc}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-osf}{m}{scit}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-osf}{b}{sc}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-osf}{bx}{sc}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-osf}{b}{n}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-osf}{bx}{n}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-osf}{b}{scit}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-osf}{bx}{scit}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-osf}{b}{it}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-osf}{bx}{it}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-osf}{m}{sl}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-osf}{b}{sl}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-osf}{bx}{sl}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-osf}{b}{scsl}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-osf}{bx}{scsl}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-osf}{m}{scsl}{<->ssub * ntxth-osf/m/it}{}
+\endinput
diff --git a/Master/texmf-dist/tex/latex/newtx/ot1ntxth-tlf.fd b/Master/texmf-dist/tex/latex/newtx/ot1ntxth-tlf.fd
new file mode 100644
index 00000000000..f8e64dae78d
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/newtx/ot1ntxth-tlf.fd
@@ -0,0 +1,28 @@
+\ProvidesFile{ot1ntxth-tlf.fd}[2021/05/06 v1.0 font definition file for OT1/ntxth/tlf]
+
+\expandafter\ifx\csname ntx@scaled\endcsname\relax
+  \let\ntx@scaled\@empty%
+\fi
+
+\ifdefined\ntx@spacing \else\global\let\ntx@spacing\@empty\fi
+%\traceon
+\DeclareFontFamily{OT1}{ntxth-tlf}{\ntx@spacing}
+\DeclareFontShape{OT1}{ntxth-tlf}{m}{it}{<-> \ntx@scaled ntxth-Italic-tlf-ot1}{}
+\DeclareFontShape{OT1}{ntxth-tlf}{m}{n}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tlf}{m}{sc}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tlf}{m}{scit}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tlf}{b}{sc}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tlf}{bx}{sc}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tlf}{b}{n}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tlf}{bx}{n}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tlf}{b}{scit}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tlf}{bx}{scit}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tlf}{b}{it}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tlf}{bx}{it}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tlf}{m}{sl}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tlf}{b}{sl}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tlf}{bx}{sl}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tlf}{b}{scsl}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tlf}{bx}{scsl}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tlf}{m}{scsl}{<->ssub * ntxth-tlf/m/it}{}
+\endinput
diff --git a/Master/texmf-dist/tex/latex/newtx/ot1ntxth-tosf.fd b/Master/texmf-dist/tex/latex/newtx/ot1ntxth-tosf.fd
new file mode 100644
index 00000000000..8a683572b24
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/newtx/ot1ntxth-tosf.fd
@@ -0,0 +1,28 @@
+\ProvidesFile{ot1ntxth-tosf.fd}[2021/05/07 v1.0 font definition file for OT1/ntxth/tosf]
+
+\expandafter\ifx\csname ntx@scaled\endcsname\relax
+  \let\ntx@scaled\@empty%
+\fi
+
+\ifdefined\ntx@spacing \else\global\let\ntx@spacing\@empty\fi
+%\traceon
+\DeclareFontFamily{OT1}{ntxth-tosf}{\ntx@spacing}
+\DeclareFontShape{OT1}{ntxth-tosf}{m}{it}{<-> \ntx@scaled ntxth-Italic-osf-ot1}{}
+\DeclareFontShape{OT1}{ntxth-tosf}{m}{n}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tosf}{m}{sc}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tosf}{m}{scit}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tosf}{b}{sc}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tosf}{bx}{sc}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tosf}{b}{n}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tosf}{bx}{n}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tosf}{b}{scit}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tosf}{bx}{scit}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tosf}{b}{it}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tosf}{bx}{it}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tosf}{m}{sl}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tosf}{b}{sl}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tosf}{bx}{sl}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tosf}{b}{scsl}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tosf}{bx}{scsl}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{OT1}{ntxth-tosf}{m}{scsl}{<->ssub * ntxth-tosf/m/it}{}
+\endinput
diff --git a/Master/texmf-dist/tex/latex/newtx/ot1ntxtlf.fd b/Master/texmf-dist/tex/latex/newtx/ot1ntxtlf.fd
index c566647cdcf..7d2c64bd7ae 100644
--- a/Master/texmf-dist/tex/latex/newtx/ot1ntxtlf.fd
+++ b/Master/texmf-dist/tex/latex/newtx/ot1ntxtlf.fd
@@ -1,4 +1,8 @@
-\ProvidesFile{ot1ntxtlf.fd}[2015/01/17 v1.0 font definition file for OT1/ntx/tlf]
+\ProvidesFile{ot1ntxtlf.fd}[2021/05/08 v1.0 font definition file for OT1/ntx/tlf]
+
+\expandafter\ifx\csname ntx@sltrue\endcsname\relax
+  \global\newif\ntx@sl\global\ntx@sltrue%
+\fi
 
 \expandafter\ifx\csname ntx@scaled\endcsname\relax
   \let\ntx@scaled\@empty%
@@ -21,9 +25,15 @@
 \DeclareFontShape{OT1}{ntxtlf}{bx}{n}{<->ssub * ntxtlf/b/n}{}
 \DeclareFontShape{OT1}{ntxtlf}{bx}{scit}{<->ssub * ntxtlf/b/scit}{}
 \DeclareFontShape{OT1}{ntxtlf}{bx}{it}{<->ssub * ntxtlf/b/it}{}
-\DeclareFontShape{OT1}{ntxtlf}{m}{sl}{<-> \ntx@scaled ntx-Italic-tlf-th-ot1}{}
-\DeclareFontShape{OT1}{ntxtlf}{b}{sl}{<->ssub * ntxtlf/m/sl}{}
-\DeclareFontShape{OT1}{ntxtlf}{bx}{sl}{<->ssub * ntxtlf/m/sl}{}
+\ifntx@sl % point to real slanted fonts
+  \DeclareFontShape{OT1}{ntxtlf}{m}{sl}{<-> \ntx@scaled txsl}{}
+  \DeclareFontShape{OT1}{ntxtlf}{b}{sl}{<-> \ntx@scaled ztmbsl-tlf-ot1}{}
+  \DeclareFontShape{OT1}{ntxtlf}{bx}{sl}{<->ssub * ntxtlf/b/sl}{}
+\else %point to theorem font
+  \DeclareFontShape{OT1}{ntxtlf}{m}{sl}{<-> \ntx@scaled ntxth-Italic-tlf-ot1}{}
+  \DeclareFontShape{OT1}{ntxtlf}{b}{sl}{<->ssub * ntxtlf/m/sl}{}
+  \DeclareFontShape{OT1}{ntxtlf}{bx}{sl}{<->ssub * ntxtlf/m/sl}{}
+\fi
 \DeclareFontShape{OT1}{ntxtlf}{b}{scsl}{<->ssub * ntxtlf/b/scit}{}
 \DeclareFontShape{OT1}{ntxtlf}{bx}{scsl}{<->ssub * ntxtlf/b/scit}{}
 \DeclareFontShape{OT1}{ntxtlf}{m}{scsl}{<->ssub * ntxtlf/m/scit}{}
diff --git a/Master/texmf-dist/tex/latex/newtx/ot1ntxtosf.fd b/Master/texmf-dist/tex/latex/newtx/ot1ntxtosf.fd
index 14a6cb7dc71..5d8421fec7b 100644
--- a/Master/texmf-dist/tex/latex/newtx/ot1ntxtosf.fd
+++ b/Master/texmf-dist/tex/latex/newtx/ot1ntxtosf.fd
@@ -1,4 +1,8 @@
-\ProvidesFile{ot1ntxtosf.fd}[2015/01/17 v1.0 font definition file for OT1/ntx/tosf]
+\ProvidesFile{ot1ntxtosf.fd}[2021/05/08 v1.0 font definition file for OT1/ntx/tosf]
+
+\expandafter\ifx\csname ntx@sltrue\endcsname\relax
+  \global\newif\ntx@sl\global\ntx@sltrue%
+\fi
 
 \expandafter\ifx\csname ntx@scaled\endcsname\relax
   \let\ntx@scaled\@empty%
@@ -23,9 +27,15 @@
 \DeclareFontShape{OT1}{ntxtosf}{bx}{n}{<->ssub * ntxtosf/b/n}{}
 \DeclareFontShape{OT1}{ntxtosf}{bx}{scit}{<->ssub * ntxtosf/b/scit}{}
 \DeclareFontShape{OT1}{ntxtosf}{bx}{it}{<->ssub * ntxtosf/b/it}{}
-\DeclareFontShape{OT1}{ntxtosf}{m}{sl}{<-> \ntx@scaled ntx-Italic-osf-th-ot1}{}
-\DeclareFontShape{OT1}{ntxtosf}{b}{sl}{<->ssub * ntxtosf/m/sl}{}
-\DeclareFontShape{OT1}{ntxtosf}{bx}{sl}{<->ssub * ntxtosf/m/sl}{}
+\ifntx@sl % point to real slanted fonts
+  \DeclareFontShape{OT1}{ntxtosf}{m}{sl}{<-> \ntx@scaled ot1xsl-tosf}{}
+  \DeclareFontShape{OT1}{ntxtosf}{b}{sl}{<-> \ntx@scaled ztmbsl-tosf-ot1}{}
+  \DeclareFontShape{OT1}{ntxtosf}{bx}{sl}{<->ssub * ntxtosf/b/sl}{}
+\else %point to theorem font
+  \DeclareFontShape{OT1}{ntxtosf}{m}{sl}{<-> \ntx@scaled ntxth-Italic-tlf-ot1}{}
+  \DeclareFontShape{OT1}{ntxtosf}{b}{sl}{<->ssub * ntxtosf/m/sl}{}
+  \DeclareFontShape{OT1}{ntxtosf}{bx}{sl}{<->ssub * ntxtosf/m/sl}{}
+\fi
 \DeclareFontShape{OT1}{ntxtosf}{b}{scsl}{<->ssub * ntxtosf/b/scit}{}
 \DeclareFontShape{OT1}{ntxtosf}{bx}{scsl}{<->ssub * ntxtosf/b/scit}{}
 \DeclareFontShape{OT1}{ntxtosf}{m}{scsl}{<->ssub * ntxtosf/m/scit}{}
diff --git a/Master/texmf-dist/tex/latex/newtx/t1ntxlf.fd b/Master/texmf-dist/tex/latex/newtx/t1ntxlf.fd
index 449bfc32b59..6e077f602f7 100644
--- a/Master/texmf-dist/tex/latex/newtx/t1ntxlf.fd
+++ b/Master/texmf-dist/tex/latex/newtx/t1ntxlf.fd
@@ -1,4 +1,8 @@
-\ProvidesFile{t1ntxlf.fd}[2015/01/17 v1.0 font definition file for T1/ntx/lf]
+\ProvidesFile{t1ntxlf.fd}[2021/05/07 v1.1 font definition file for T1/ntx/lf]
+
+\expandafter\ifx\csname ntx@sltrue\endcsname\relax
+  \global\newif\ntx@sl\global\ntx@sltrue%
+\fi
 
 \expandafter\ifx\csname ntx@scaled\endcsname\relax
   \let\ntx@scaled\@empty%
@@ -21,9 +25,16 @@
 \DeclareFontShape{T1}{ntxlf}{bx}{n}{<->ssub * ntxlf/b/n}{}
 \DeclareFontShape{T1}{ntxlf}{bx}{scit}{<->ssub * ntxlf/b/scit}{}
 \DeclareFontShape{T1}{ntxlf}{bx}{it}{<->ssub * ntxlf/b/it}{}
-\DeclareFontShape{T1}{ntxlf}{m}{sl}{<-> \ntx@scaled ntx-Italic-tlf-th-t1}{}
-\DeclareFontShape{T1}{ntxlf}{b}{sl}{<->ssub * ntxlf/m/sl}{}
-\DeclareFontShape{T1}{ntxlf}{bx}{sl}{<->ssub * ntxlf/m/sl}{}
+\ifntx@sl % point to real slanted fonts
+  \DeclareFontShape{T1}{ntxlf}{m}{sl}{<-> \ntx@scaled t1xsl-lf}{}
+  \DeclareFontShape{T1}{ntxlf}{b}{sl}{<-> \ntx@scaled ztmbsl-lf-t1}{}
+  \DeclareFontShape{T1}{ntxlf}{bx}{sl}{<->ssub * ntxlf/b/sl}{}
+\else %point to theorem font
+  \DeclareFontShape{T1}{ntxlf}{m}{sl}{<-> \ntx@scaled ntxth-Italic-tlf-t1}{}
+  \DeclareFontShape{T1}{ntxlf}{b}{sl}{<->ssub * ntxlf/m/sl}{}
+  \DeclareFontShape{T1}{ntxlf}{bx}{sl}{<->ssub * ntxlf/m/sl}{}
+\fi
+
 \DeclareFontShape{T1}{ntxlf}{b}{scsl}{<->ssub * ntxlf/b/scit}{}
 \DeclareFontShape{T1}{ntxlf}{bx}{scsl}{<->ssub * ntxlf/b/scit}{}
 \DeclareFontShape{T1}{ntxlf}{m}{scsl}{<->ssub * ntxlf/m/scit}{}
diff --git a/Master/texmf-dist/tex/latex/newtx/t1ntxosf.fd b/Master/texmf-dist/tex/latex/newtx/t1ntxosf.fd
index d84c8bd7705..20b9fbf84ce 100644
--- a/Master/texmf-dist/tex/latex/newtx/t1ntxosf.fd
+++ b/Master/texmf-dist/tex/latex/newtx/t1ntxosf.fd
@@ -1,4 +1,8 @@
-\ProvidesFile{t1ntxosf.fd}[2015/01/17 v1.0 font definition file for T1/ntx/osf]
+\ProvidesFile{t1ntxosf.fd}[2021/05/07 v1.1 font definition file for T1/ntx/osf]
+
+\expandafter\ifx\csname ntx@sltrue\endcsname\relax
+  \global\newif\ntx@sl\global\ntx@sltrue%
+\fi
 
 \expandafter\ifx\csname ntx@scaled\endcsname\relax
   \let\ntx@scaled\@empty%
@@ -21,9 +25,16 @@
 \DeclareFontShape{T1}{ntxosf}{bx}{n}{<->ssub * ntxosf/b/n}{}
 \DeclareFontShape{T1}{ntxosf}{bx}{scit}{<->ssub * ntxosf/b/scit}{}
 \DeclareFontShape{T1}{ntxosf}{bx}{it}{<->ssub * ntxosf/b/it}{}
-\DeclareFontShape{T1}{ntxosf}{m}{sl}{<-> \ntx@scaled ntx-Italic-osf-th-t1}{}
-\DeclareFontShape{T1}{ntxosf}{b}{sl}{<->ssub * ntxosf/m/sl}{}
-\DeclareFontShape{T1}{ntxosf}{bx}{sl}{<->ssub * ntxosf/m/sl}{}
+\ifntx@sl % point to real slanted fonts
+  \DeclareFontShape{T1}{ntxosf}{m}{sl}{<-> \ntx@scaled t1xsl-osf}{}
+  \DeclareFontShape{T1}{ntxosf}{b}{sl}{<-> \ntx@scaled ztmbsl-osf-t1}{}
+  \DeclareFontShape{T1}{ntxosf}{bx}{sl}{<->ssub * ntxosf/b/sl}{}
+\else %point to theorem font
+  \DeclareFontShape{T1}{ntxosf}{m}{sl}{<-> \ntx@scaled ntxth-Italic-osf-t1}{}
+  \DeclareFontShape{T1}{ntxosf}{b}{sl}{<->ssub * ntxosf/m/sl}{}
+  \DeclareFontShape{T1}{ntxosf}{bx}{sl}{<->ssub * ntxosf/m/sl}{}
+\fi
+
 \DeclareFontShape{T1}{ntxosf}{b}{scsl}{<->ssub * ntxosf/b/scit}{}
 \DeclareFontShape{T1}{ntxosf}{bx}{scsl}{<->ssub * ntxosf/b/scit}{}
 \DeclareFontShape{T1}{ntxosf}{m}{scsl}{<->ssub * ntxosf/m/scit}{}
diff --git a/Master/texmf-dist/tex/latex/newtx/t1ntxth-lf.fd b/Master/texmf-dist/tex/latex/newtx/t1ntxth-lf.fd
new file mode 100644
index 00000000000..743672592a1
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/newtx/t1ntxth-lf.fd
@@ -0,0 +1,28 @@
+\ProvidesFile{t1ntxth-lf.fd}[2021/05/07 v1.0 font definition file for T1/ntxth/lf]
+
+\expandafter\ifx\csname ntx@scaled\endcsname\relax
+  \let\ntx@scaled\@empty%
+\fi
+
+\ifdefined\ntx@spacing \else\global\let\ntx@spacing\@empty\fi
+%\traceon
+\DeclareFontFamily{T1}{ntxth-lf}{\ntx@spacing}
+\DeclareFontShape{T1}{ntxth-lf}{m}{it}{<-> \ntx@scaled ntxth-Italic-tlf-t1}{}
+\DeclareFontShape{T1}{ntxth-lf}{m}{n}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{T1}{ntxth-lf}{m}{sc}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{T1}{ntxth-lf}{m}{scit}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{T1}{ntxth-lf}{b}{sc}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{T1}{ntxth-lf}{bx}{sc}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{T1}{ntxth-lf}{b}{n}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{T1}{ntxth-lf}{bx}{n}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{T1}{ntxth-lf}{b}{scit}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{T1}{ntxth-lf}{bx}{scit}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{T1}{ntxth-lf}{b}{it}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{T1}{ntxth-lf}{bx}{it}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{T1}{ntxth-lf}{m}{sl}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{T1}{ntxth-lf}{b}{sl}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{T1}{ntxth-lf}{bx}{sl}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{T1}{ntxth-lf}{b}{scsl}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{T1}{ntxth-lf}{bx}{scsl}{<->ssub * ntxth-lf/m/it}{}
+\DeclareFontShape{T1}{ntxth-lf}{m}{scsl}{<->ssub * ntxth-lf/m/it}{}
+\endinput
diff --git a/Master/texmf-dist/tex/latex/newtx/t1ntxth-osf.fd b/Master/texmf-dist/tex/latex/newtx/t1ntxth-osf.fd
new file mode 100644
index 00000000000..f428e63995b
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/newtx/t1ntxth-osf.fd
@@ -0,0 +1,28 @@
+\ProvidesFile{t1ntxth-osf.fd}[2021/05/07 v1.0 font definition file for T1/ntxth/osf]
+
+\expandafter\ifx\csname ntx@scaled\endcsname\relax
+  \let\ntx@scaled\@empty%
+\fi
+
+\ifdefined\ntx@spacing \else\global\let\ntx@spacing\@empty\fi
+%\traceon
+\DeclareFontFamily{T1}{ntxth-osf}{\ntx@spacing}
+\DeclareFontShape{T1}{ntxth-osf}{m}{it}{<-> \ntx@scaled ntxth-Italic-osf-t1}{}
+\DeclareFontShape{T1}{ntxth-osf}{m}{n}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{T1}{ntxth-osf}{m}{sc}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{T1}{ntxth-osf}{m}{scit}{<-> ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{T1}{ntxth-osf}{b}{sc}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{T1}{ntxth-osf}{bx}{sc}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{T1}{ntxth-osf}{b}{n}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{T1}{ntxth-osf}{bx}{n}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{T1}{ntxth-osf}{b}{scit}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{T1}{ntxth-osf}{bx}{scit}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{T1}{ntxth-osf}{b}{it}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{T1}{ntxth-osf}{bx}{it}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{T1}{ntxth-osf}{m}{sl}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{T1}{ntxth-osf}{b}{sl}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{T1}{ntxth-osf}{bx}{sl}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{T1}{ntxth-osf}{b}{scsl}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{T1}{ntxth-osf}{bx}{scsl}{<->ssub * ntxth-osf/m/it}{}
+\DeclareFontShape{T1}{ntxth-osf}{m}{scsl}{<->ssub * ntxth-osf/m/it}{}
+\endinput
diff --git a/Master/texmf-dist/tex/latex/newtx/t1ntxth-tlf.fd b/Master/texmf-dist/tex/latex/newtx/t1ntxth-tlf.fd
new file mode 100644
index 00000000000..d4ace2c2cea
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/newtx/t1ntxth-tlf.fd
@@ -0,0 +1,28 @@
+\ProvidesFile{t1ntxth-tlf.fd}[2021/05/06 v1.0 font definition file for T1/ntxth/tlf]
+
+\expandafter\ifx\csname ntx@scaled\endcsname\relax
+  \let\ntx@scaled\@empty%
+\fi
+
+\ifdefined\ntx@spacing \else\global\let\ntx@spacing\@empty\fi
+
+\DeclareFontFamily{T1}{ntxth-tlf}{\ntx@spacing}
+\DeclareFontShape{T1}{ntxth-tlf}{m}{it}{<-> \ntx@scaled ntxth-Italic-tlf-t1}{}
+\DeclareFontShape{T1}{ntxth-tlf}{m}{n}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tlf}{m}{sc}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tlf}{m}{scit}{<-> ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tlf}{b}{sc}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tlf}{bx}{sc}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tlf}{b}{n}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tlf}{bx}{n}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tlf}{b}{scit}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tlf}{bx}{scit}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tlf}{b}{it}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tlf}{bx}{it}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tlf}{m}{sl}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tlf}{b}{sl}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tlf}{bx}{sl}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tlf}{b}{scsl}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tlf}{bx}{scsl}{<->ssub * ntxth-tlf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tlf}{m}{scsl}{<->ssub * ntxth-tlf/m/it}{}
+\endinput
diff --git a/Master/texmf-dist/tex/latex/newtx/t1ntxth-tosf.fd b/Master/texmf-dist/tex/latex/newtx/t1ntxth-tosf.fd
new file mode 100644
index 00000000000..cfa6c457703
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/newtx/t1ntxth-tosf.fd
@@ -0,0 +1,28 @@
+\ProvidesFile{t1ntxth-tosf.fd}[2021/05/07 v1.0 font definition file for T1/ntxth/tosf]
+
+\expandafter\ifx\csname ntx@scaled\endcsname\relax
+  \let\ntx@scaled\@empty%
+\fi
+
+\ifdefined\ntx@spacing \else\global\let\ntx@spacing\@empty\fi
+%\traceon
+\DeclareFontFamily{T1}{ntxth-tosf}{\ntx@spacing}
+\DeclareFontShape{T1}{ntxth-tosf}{m}{it}{<-> \ntx@scaled ntxth-Italic-osf-t1}{}
+\DeclareFontShape{T1}{ntxth-tosf}{m}{n}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tosf}{m}{sc}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tosf}{m}{scit}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tosf}{b}{sc}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tosf}{bx}{sc}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tosf}{b}{n}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tosf}{bx}{n}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tosf}{b}{scit}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tosf}{bx}{scit}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tosf}{b}{it}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tosf}{bx}{it}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tosf}{m}{sl}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tosf}{b}{sl}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tosf}{bx}{sl}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tosf}{b}{scsl}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tosf}{bx}{scsl}{<->ssub * ntxth-tosf/m/it}{}
+\DeclareFontShape{T1}{ntxth-tosf}{m}{scsl}{<->ssub * ntxth-tosf/m/it}{}
+\endinput
diff --git a/Master/texmf-dist/tex/latex/newtx/t1ntxtlf.fd b/Master/texmf-dist/tex/latex/newtx/t1ntxtlf.fd
index 2c3182cc808..9de08e5de0e 100644
--- a/Master/texmf-dist/tex/latex/newtx/t1ntxtlf.fd
+++ b/Master/texmf-dist/tex/latex/newtx/t1ntxtlf.fd
@@ -1,4 +1,8 @@
-\ProvidesFile{t1ntxtlf.fd}[2015/01/17 v1.0 font definition file for T1/ntx/tlf]
+\ProvidesFile{t1ntxtlf.fd}[2021/05/07 v1.1 font definition file for T1/ntx/tlf]
+
+\expandafter\ifx\csname ntx@sltrue\endcsname\relax
+  \global\newif\ntx@sl\global\ntx@sltrue%
+\fi
 
 \expandafter\ifx\csname ntx@scaled\endcsname\relax
   \let\ntx@scaled\@empty%
@@ -21,9 +25,18 @@
 \DeclareFontShape{T1}{ntxtlf}{bx}{n}{<->ssub * ntxtlf/b/n}{}
 \DeclareFontShape{T1}{ntxtlf}{bx}{scit}{<->ssub * ntxtlf/b/scit}{}
 \DeclareFontShape{T1}{ntxtlf}{bx}{it}{<->ssub * ntxtlf/b/it}{}
-\DeclareFontShape{T1}{ntxtlf}{m}{sl}{<-> \ntx@scaled ntx-Italic-tlf-th-t1}{}
-\DeclareFontShape{T1}{ntxtlf}{b}{sl}{<->ssub * ntxtlf/m/sl}{}
-\DeclareFontShape{T1}{ntxtlf}{bx}{sl}{<->ssub * ntxtlf/m/sl}{}
+\ifntx@sl % point to real slanted fonts
+  \DeclareFontShape{T1}{ntxtlf}{m}{sl}{<-> \ntx@scaled t1xsl}{}
+  \DeclareFontShape{T1}{ntxtlf}{b}{sl}{<-> \ntx@scaled ztmbsl-tlf-t1}{}
+  \DeclareFontShape{T1}{ntxtlf}{bx}{sl}{<->ssub * ntxtlf/b/sl}{}
+
+\else %point to theorem font
+  \DeclareFontShape{T1}{ntxtlf}{m}{sl}{<-> \ntx@scaled ntxth-Italic-tlf-t1}{}
+  \DeclareFontShape{T1}{ntxtlf}{b}{sl}{<->ssub * ntxtlf/m/sl}{}
+  \DeclareFontShape{T1}{ntxtlf}{bx}{sl}{<->ssub * ntxtlf/m/sl}{}
+
+\fi
+
 \DeclareFontShape{T1}{ntxtlf}{b}{scsl}{<->ssub * ntxtlf/b/scit}{}
 \DeclareFontShape{T1}{ntxtlf}{bx}{scsl}{<->ssub * ntxtlf/b/scit}{}
 \DeclareFontShape{T1}{ntxtlf}{m}{scsl}{<->ssub * ntxtlf/m/scit}{}
diff --git a/Master/texmf-dist/tex/latex/newtx/t1ntxtosf.fd b/Master/texmf-dist/tex/latex/newtx/t1ntxtosf.fd
index ee3e68f46b4..bca2a799f04 100644
--- a/Master/texmf-dist/tex/latex/newtx/t1ntxtosf.fd
+++ b/Master/texmf-dist/tex/latex/newtx/t1ntxtosf.fd
@@ -1,4 +1,8 @@
-\ProvidesFile{t1ntxtosf.fd}[2015/01/17 v1.0 font definition file for T1/ntx/tosf]
+\ProvidesFile{t1ntxtosf.fd}[2021/05/07 v1.1 font definition file for T1/ntx/tosf]
+
+\expandafter\ifx\csname ntx@sltrue\endcsname\relax
+  \global\newif\ntx@sl\global\ntx@sltrue%
+\fi
 
 \expandafter\ifx\csname ntx@scaled\endcsname\relax
   \let\ntx@scaled\@empty%
@@ -23,9 +27,16 @@
 \DeclareFontShape{T1}{ntxtosf}{bx}{n}{<->ssub * ntxtosf/b/n}{}
 \DeclareFontShape{T1}{ntxtosf}{bx}{scit}{<->ssub * ntxtosf/b/scit}{}
 \DeclareFontShape{T1}{ntxtosf}{bx}{it}{<->ssub * ntxtosf/b/it}{}
-\DeclareFontShape{T1}{ntxtosf}{m}{sl}{<-> \ntx@scaled ntx-Italic-osf-th-t1}{}
-\DeclareFontShape{T1}{ntxtosf}{b}{sl}{<->ssub * ntxtosf/m/sl}{}
-\DeclareFontShape{T1}{ntxtosf}{bx}{sl}{<->ssub * ntxtosf/m/sl}{}
+\ifntx@sl % point to real slanted fonts
+  \DeclareFontShape{T1}{ntxtosf}{m}{sl}{<-> \ntx@scaled t1xsl-tosf}{}
+  \DeclareFontShape{T1}{ntxtosf}{b}{sl}{<-> \ntx@scaled ztmbsl-tosf-t1}{}
+  \DeclareFontShape{T1}{ntxtosf}{bx}{sl}{<->ssub * ntxtosf/b/sl}{}
+\else %point to theorem font
+  \DeclareFontShape{T1}{ntxtosf}{m}{sl}{<-> \ntx@scaled ntxth-Italic-osf-t1}{}
+  \DeclareFontShape{T1}{ntxtosf}{b}{sl}{<->ssub * ntxtosf/m/sl}{}
+  \DeclareFontShape{T1}{ntxtosf}{bx}{sl}{<->ssub * ntxtosf/m/sl}{}
+\fi
+
 \DeclareFontShape{T1}{ntxtosf}{b}{scsl}{<->ssub * ntxtosf/b/scit}{}
 \DeclareFontShape{T1}{ntxtosf}{bx}{scsl}{<->ssub * ntxtosf/b/scit}{}
 \DeclareFontShape{T1}{ntxtosf}{m}{scsl}{<->ssub * ntxtosf/m/scit}{}