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+\centerline{\bf Pira's Precursor}
+\noindent
+Pira (the Research Association for the
+Paper \&\ Board, Printing, and
+Packaging Industries)
+is about to start publication of `Commentary'
+which will cover the area of `Desktop Publishing'.
+
+They have already published a `Precursor Issue',
+which made quite interesting reading. Especially
+relevant to \TeX\ was their definition of desktop publishing, namely:
+``any system which allows someone --- using a desktop
+terminal --- to produce a document of typeset or near-typeset quality\dots
+It can run on a microcomputer or a large mainframe.''
+
+Less agreeable are the enormous sums which it will
+take to receive this twice quarterly (I think that means 8 times a year)
+publication. First-year subscription is \quid350, although members of
+Pira are elegible for a discount of \quid70, making it a mere \quid280.
+I used to have this weird idea that electronic publication might
+make things cheaper. Silly me.  It therefore comes as no real surprise
+that ``The contents of Pira Desktop Publishing Commentary may not be
+reproduced by any means without  the prior permission of the publisher in
+writing''. I am relieved that I merely quote from the Precursor Issue,
+and not the real thing. It is rather interesting how the idea of
+emulating the Seybold Report mobilises money-spinning ideas.
+Contact:
+{\obeylines\parindent2em
+Pira
+Randalls Road
+Leatherhead
+Surrey KT22 7RU
+0372 376161}
+
+
+\rightline{\sl Malcolm W Clark}
+\bigskip
+\vfil
+\centerline{\bf Bug}
+\noindent
+There is a bug in the current versions of \TeX.
+It is a little esoteric, but qualified its
+finder for a fairly handsome cheque from
+Donald Knuth. Its finder was Donald Knuth himself:
+ if you type a space after
+a hyphen or dash, you do not get optimum line breaks.
+If you look through the \TeX book, you will notice that
+Knuth seldom (if ever) puts spaces after dashes. Which
+may help to explain why it has taken so long to surface,
+or to be recognised. In TUGboat, Knuth says that he
+has sent details of the changes necessary to
+all the main implementors, and that he expects a
+new version to be available from those implementors
+in the future.
+
+\bigskip\vfil
+\centerline{\bf TUGboat}
+\noindent
+There are several references in \TeX line to TUGboat.
+TUGboat contains the communications of the
+\TeX\ Users Group (TUG), and is published ``irregularly''
+(about three times a year).  If you are seriously
+interested in \TeX, you really ought to join TUG,
+and therefore receive TUGboat.
+Since it covers the whole field of \TeX\ endeavour
+there is usually something for everyone. I personally
+feel that it could increase its coverage of simple
+or beginning \TeX, and afford to recap the current
+position, just for those who don't know. However, besides
+ detailed accounts
+of ``how I implemented \TeX\ on the Lemon FAU-32,
+despite overwhelming odds'', it includes topics of far
+more general
+interest. Naturally TUGboat covers \MF\ and {\tt WEB}.
+As more \TeX\ related products come along, the
+amount of advertising material has increased too.
+I find this very useful, although I do find certain
+US and Canadian advertisers a little reluctant to communicate with
+Europe.
+To join TUG, contact
+{\obeylines\parindent2em
+\TeX\ Users Group
+PO Box 9506
+Providence
+RI 02940
+USA
+}
+
+\bigskip\vfil
+\centerline{\bf Mac\MFb}
+\noindent
+There is now an implementation of \MF\ for the Macintosh.
+Victor Ostromoukhov has ported \MF\ to work on
+any Mac with at least 512K of memory and 2 floppies.
+It looks remarkably attractive. I have included
+one of Victor's screen hardcopies in this \TeX line.
+He says that it is NOT a commercial distribution, but
+that he would like some ``reasonable participation in expenses''.
+If you would like more information, contact
+{\obeylines\parindent2em
+Victor Ostromoukhov
+25 Rue P\'eclet
+75015 Paris
+France
+}
+
+\bigskip\vfil
+\centerline{\bf \LaTeX\ problems}
+\noindent
+The following problem has been observed on
+an IBM pc clone running micro\TeX\ with \LaTeX.
+The micro ``quite often gets locked and has to
+be rebooted''. This can happen with
+short or long files; the {\tt .log} file is
+not available. After rebooting, the file seems to
+be accepted without demur. The problem
+has never been encountered with \TeX\ itself. Has anyone else encountered
+similar problems?
+
+\rightline{\sl Mark Bicknell}
+
+\bigskip\vfil
+\centerline{\bf More symbols for \TeX}
+\noindent
+Although \TeX\ has a bewilderingly large array of
+special symbols and operators, inevitably there are
+omissions. One such is a `three dot' accent,
+analagous to |\dot| and |\ddot|. This is not
+particularly difficult to provide, through the use
+of |\mathchoice|. The main problem lies in finding
+the correct gap between the new accent and the group it
+accents, for each style. The use of |\mathcoice|
+is rather expensive for \TeX, since it assiduously
+calculates each of the four possibilities when it
+is referenced, not knowing which one it will use.
+The code looks something like this:
+\def\dddot#1{
+  \def\ddd{.\mkern-1.8mu.\mkern-1.8mu.}
+\mathchoice
+%displaystyle
+  {\vbox{\offinterlineskip
+  \halign{\hfil##\hfil\crcr
+  $\smash{\displaystyle\ddd}$\crcr
+  \noalign{\vskip0.4ex}
+  $\displaystyle{#1}$\crcr}}}
+%textstyle
+  {\vbox{\offinterlineskip
+  \halign{\hfil##\hfil\crcr
+  $\smash{\textstyle\ddd}$\crcr
+  \noalign{\vskip0.38ex}
+  $\textstyle{#1}$\crcr}}}
+%scriptstyle
+  {\vbox{\offinterlineskip
+   \halign{\hfil##\hfil\crcr
+  $\smash{\scriptstyle\ddd}$\crcr
+  \noalign{\vskip0.3ex}
+  $\scriptstyle{#1}$\crcr}}}
+%scriptscriptstyle
+  {\vbox{\offinterlineskip
+  \halign{\hfil##\hfil\crcr
+  $\smash{\scriptscriptstyle\ddd}$\crcr
+  \noalign{\vskip0.17ex}
+  $\scriptscriptstyle{#1}$\crcr}}}}
+\begintt
+\def\dddot#1{
+  \def\ddd{.\mkern-1.8mu.\mkern-1.8mu.}
+\mathchoice
+%displaystyle
+  {\vbox{\offinterlineskip
+  \halign{\hfil##\hfil\crcr
+  $\smash{\displaystyle\ddd}$\crcr
+  \noalign{\vskip0.4ex}%
+  $\displaystyle{#1}$\crcr}}}
+%textstyle
+  {\vbox{\offinterlineskip
+  \halign{\hfil##\hfil\crcr
+  $\smash{\textstyle\ddd}$\crcr
+  \noalign{\vskip0.38ex}
+  $\textstyle{#1}$\crcr}}}
+%scriptstyle
+  {\vbox{\offinterlineskip
+  \halign{\hfil##\hfil\crcr
+  $\smash{\scriptstyle\ddd}$\crcr
+  \noalign{\vskip0.3ex}
+  $\scriptstyle{#1}$\crcr}}}
+%scriptscriptstyle
+  {\vbox{\offinterlineskip
+  \halign{\hfil##\hfil\crcr
+  $\smash{\scriptscriptstyle\ddd}$\crcr
+  \noalign{\vskip0.17ex}
+  $\scriptscriptstyle{#1}$\crcr}}}}
+\endtt
+
+Similarly, it is sometimes useful to be able to place
+accents {\it under} a maths character. I did this
+for `under tilde':
+\def\ut#1{   \def\t{\char'176}
+  \mathchoice
+%displaystyle  
+  {\vtop{\ialign{##\crcr
+  $\hfil\displaystyle{#1}\hfil$\crcr\noalign
+  {\nointerlineskip\vskip1pt}
+  $\hfil\displaystyle\t\hfil$\crcr}}}  
+%textstyle
+  {\smash
+  {\vtop{\ialign{##\crcr
+  $\hfil\textstyle{#1}\hfil$\crcr\noalign
+  {\nointerlineskip\vskip1pt}
+  $\hfil\textstyle\t\hfil$\crcr}}}
+  {\textstyle\vphantom{#1}}}
+%scriptstyle
+  {\vtop{\ialign{##\crcr
+  $\hfil\scriptstyle{#1}\hfil$\crcr\noalign 
+  {\nointerlineskip\vskip0.7pt}
+  $\scriptstyle\hfil\t\hfil$\crcr}}}
+%scriptscriptstyle
+  {\vtop{\ialign{##\crcr
+  $\hfil\scriptscriptstyle{#1}\hfil$\crcr
+  \noalign{\nointerlineskip\vskip0.5pt}
+  $\scriptscriptstyle\hfil\t\hfil$\crcr}}}}
+\begintt
+\def\ut#1{   \def\t{\char'176}
+  \mathchoice
+%displaystyle  
+  {\vtop{\ialign{##\crcr
+  $\hfil\displaystyle{#1}\hfil$\crcr\noalign
+  {\nointerlineskip\vskip1pt}
+  $\hfil\displaystyle\t\hfil$\crcr}}}
+%textstyle
+  {\smash
+  {\vtop{\ialign{##\crcr
+  $\hfil\textstyle{#1}\hfil$\crcr\noalign
+  {\nointerlineskip\vskip1pt}
+  $\hfil\textstyle\t\hfil$\crcr}}}
+  {\textstyle\vphantom{#1}}}
+%scriptstyle
+  {\vtop{\ialign{##\crcr
+  $\hfil\scriptstyle{#1}\hfil$\crcr
+  \noalign{\nointerlineskip\vskip0.7pt}
+  $\scriptstyle\hfil\t\hfil$\crcr}}}
+%scriptscriptstyle
+  {\vtop{\ialign{##\crcr
+  $\hfil\scriptscriptstyle{#1}\hfil$\crcr
+  \noalign{\nointerlineskip\vskip0.5pt}
+  $\scriptscriptstyle\hfil\t\hfil$\crcr}}}
+}
+\endtt
+
+Taken together, they allow you to write something
+like
+$$\ut{A}^{\dddot{a+b}}-\dddot{\ut{c}}_{\dddot{A}}$$
+should you ever want. The triple dots don't always look
+centred, but this is consistent
+with |\dot| and |\ddot|.
+
+Of course, there must be better ways to do both of these,
+mustn't there? But a word of warning: I use the cmr fonts.
+If you use these definitions for the amr fonts, you will have
+to modify them slightly. I originally devloped them with
+\TeX tures, which uses cmr, and intended to include them in
+the last \TeX line, which was done with micro\TeX, using amr.
+ The |\ut| seemed fine, but the |\dddot| looked dreadful!
+The moral of this is that you cannot expect that definitions
+for one font will necessarily work in another (which you
+knew), and that amr and cmr should be treated as different fonts.
+
+I was asked if I could do an `operator that looked
+just like the |\diamondsuit| character with a plus sign
+in it, the plus filling the symbol', for a book on
+logic. At least that isn't too difficult:
+\def\diamondplus{\mathop
+{\diamondsuit\mkern-14mu
+\raise0.45pt\hbox{$+$}}}
+\begintt
+\def\diamondplus{\mathop
+{\diamondsuit\mkern-14mu
+\raise0.45pt\hbox{$+$}}}
+\endtt
+but of course it wasn't big enough. At least
+it gives something like $A\diamondplus B$. However I leave
+you to fiddle about with all the bits and pieces
+that would be required if you used the next |\magstep|
+font.
+
+Among all the rather wonderful things in \TeX hax
+(well, they make me wonder), were a few macros for
+other extended symbols which may be useful
+to someone somewhere.
+The question from
+William LeFebvre at Rice
+was ``what am I supposed
+to use to represent these different sets:
+Real numbers, Natural numbers, Imaginary numbers,
+and Complex numbers.'' Leslie Stockhausen and Gus Gassman
+of Dalhousie University replied with four short macros.
+
+I confess I have modified
+them very slightly, by substituting |\mkern|s
+for the use of multiple |\!| and |\;| which I thought non-aesthetic.
+I also changed from amssqi to cmssqi, which made
+the absolute amounts of movement slightly different ---
+but this applied only to |\IC|.
+
+The modified macros then become:
+\begintt
+\def\IR{\hbox{$I\mkern-6muR$}}
+\def\IP{\hbox{$I\mkern-6muP$}}
+\def\IN{\hbox{$I\mkern-6muN$}}
+\font\sqi=cmssqi8
+\def\IC{\hbox{$C\mkern-13.5mu
+\raise0.49pt\hbox{\sqi I}\mkern9mu$}}
+\endtt
+\def\IR{\hbox{$I\mkern-6muR$}}
+\def\IP{\hbox{$I\mkern-6muP$}}
+\def\IN{\hbox{$I\mkern-6muN$}}
+\font\sqi=cmssqi8
+\def\IC{\hbox{$C\mkern-13.5mu
+\raise0.49pt\hbox{\sqi I}\mkern9mu$}}
+Once defined, you can then say things like
+$\IC\IR\IP\IN$. The bar of the |\IC| is perhaps
+a little close, but the largest `standard' size
+of the cmssqi font is 8pt.
+
+\rightline{\sl Malcolm W Clark}
+\vfil