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+<head>
+<title>UK TeX FAQ -- question label numbersets</title>
+</head><body>
+<h3>Symbols for the number sets</h3>
+<p/>It is a good idea to have commands such as <code>\</code><code>R</code> for the real numbers and
+other standard number sets. Traditionally these were typeset in bold.
+Because, in the ordinary course of events, mathematicians do not have
+access to bold chalk, they invented the special symbols that are now
+often used for <code>\</code><code>R</code>, <code>\</code><code>C</code>, <em>etc</em>. These symbols are known
+as &ldquo;blackboard bold&rdquo;. Before insisting on using them, consider
+whether going back to the old system of ordinary bold might not be
+acceptable (it is certainly simpler).
+<p/>A set of blackboard bold capitals is available in the AMS
+<i>msbm</i> fonts (<i>msbm</i> is available at a range of
+design sizes, with names such as <i>msbm10</i>). The pair of font
+families (the other is called <i>msam</i>) have a large number of
+mathematical symbols to supplement the ones in the standard TeX
+distribution, and are available in Type 1 format with most modern
+distributions. Support files for using the fonts, both under
+Plain TeX and LaTeX (packages <i>amssymb</i> and
+<i>amsfonts</i>), are available. The font shape is a rather
+austere sans, which many people don&rsquo;t like (though it captures the
+essence of quickly-chalked writing rather well).
+<p/>The <i>bbold</i> family is set of blackboard bold fonts written in
+Metafont. This set offers blackboard bold forms of lower-case letters;
+the font source directory also contains sources for a LaTeX package
+that enables use of the fonts. The fonts are not available in Type 1 format.
+<p/>The <i>bbm</i> family claims to provide
+&lsquo;blackboard&rsquo; versions of most of the <i>cm</i> fonts ... including
+the bold and bold-extended series. Again, the fonts are designed in
+Metafont and are not available in Type 1 format. LaTeX macro support
+comes from a package by Torsten Hilbrich.
+<p/>The <i>doublestroke</i> family comes in just roman
+and sans shapes, at a single weight, and is available both as Metafont
+sources and as Type 1; the font covers the uppercase latin letters,
+lowercase &lsquo;h&rsquo; and &rsquo;k&rsquo;, and the digit &lsquo;1&rsquo;.
+<p/>An alternative source of Type 1 fonts with blackboard bold characters
+may be found in the steadily increasing set of complete families, both
+commercial and free, that have been prepared for use with (La)TeX
+(see
+&ldquo;<a href="FAQ-psfchoice.html">choice of outline fonts</a>&rdquo;).
+Of the free sets, the <i>txfonts</i> and <i>pxfonts</i> families
+both come with replicas of <i>msam</i> and <i>msbm</i>
+(though, as noted elsewhere, there are other reasons not to use these
+fonts). The <i>mathpazo</i> family includes a &ldquo;mathematically
+significant&rdquo; choice of blackboard bold characters, and the
+<i>fourier</i> fonts contain blackboard bold upper-case letters,
+the digit &lsquo;1&rsquo;, and lower-case &lsquo;k&rsquo;.
+<p/>The &ldquo;lazy person&rsquo;s&rdquo; blackboard bold macros:
+<blockquote>
+<pre>
+\newcommand{\R}{{\sf R\hspace*{-0.9ex}%
+ \rule{0.15ex}{1.5ex}\hspace*{0.9ex}}}
+\newcommand{\N}{{\sf N\hspace*{-1.0ex}%
+ \rule{0.15ex}{1.3ex}\hspace*{1.0ex}}}
+\newcommand{\Q}{{\sf Q\hspace*{-1.1ex}%
+ \rule{0.15ex}{1.5ex}\hspace*{1.1ex}}}
+\newcommand{\C}{{\sf C\hspace*{-0.9ex}%
+ \rule{0.15ex}{1.3ex}\hspace*{0.9ex}}}
+</pre>
+</blockquote><p>
+are almost acceptable at normal size if the surrounding text is
+<i>cmr10</i>. However, they are not part of a proper maths font,
+and so do not work in sub- and superscripts. Moreover, the size and
+position of the vertical bar can be affected by the font of the
+surrounding text. As we&rsquo;ve seen, there are plenty of alternatives:
+don&rsquo;t try the macros, or anything similar using capital &lsquo;I&rsquo; (which
+looks even worse!).
+<dl>
+<dt><tt><i>AMS support files (Plain)</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/fonts/amsfonts/plaintex.zip">fonts/amsfonts/plaintex</a> (<a href="ftp://cam.ctan.org/tex-archive/fonts/amsfonts/plaintex.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/fonts/amsfonts/plaintex/">browse</a>)
+<dt><tt><i>AMS support files (LaTeX)</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/fonts/amsfonts/latex.zip">fonts/amsfonts/latex</a> (<a href="ftp://cam.ctan.org/tex-archive/fonts/amsfonts/latex.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/fonts/amsfonts/latex/">browse</a>)
+<dt><tt><i>AMS symbol fonts</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/fonts/amsfonts/sources/symbols.zip">fonts/amsfonts/sources/symbols</a> (<a href="ftp://cam.ctan.org/tex-archive/fonts/amsfonts/sources/symbols.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/fonts/amsfonts/sources/symbols/">browse</a>)
+<dt><tt><i>AMS symbol fonts in Type 1 format</i></tt><dd>Browse <a href="http://www.tex.ac.uk/tex-archive/fonts/amsfonts/ps-type1/">fonts/amsfonts/ps-type1/</a>
+<dt><tt><i>bbm fonts</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/fonts/cm/bbm.zip">fonts/cm/bbm</a> (<a href="ftp://cam.ctan.org/tex-archive/fonts/cm/bbm.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/fonts/cm/bbm/">browse</a>)
+<dt><tt><i>bbm macros</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/bbm.zip">macros/latex/contrib/bbm</a> (<a href="ftp://cam.ctan.org/tex-archive/macros/latex/contrib/bbm.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/macros/latex/contrib/bbm/">browse</a>)
+<dt><tt><i>bbold fonts</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/fonts/bbold.zip">fonts/bbold</a> (<a href="ftp://cam.ctan.org/tex-archive/fonts/bbold.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/fonts/bbold/">browse</a>)
+<dt><tt><i>doublestroke fonts</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/fonts/doublestroke.zip">fonts/doublestroke</a> (<a href="ftp://cam.ctan.org/tex-archive/fonts/doublestroke.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/fonts/doublestroke/">browse</a>)
+<dt><tt><i>fourier fonts</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/fonts/fourier-GUT.zip">fonts/fourier-GUT</a> (<a href="ftp://cam.ctan.org/tex-archive/fonts/fourier-GUT.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/fonts/fourier-GUT/">browse</a>)
+<dt><tt><i>mathpazo fonts</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/fonts/mathpazo.zip">fonts/mathpazo</a> (<a href="ftp://cam.ctan.org/tex-archive/fonts/mathpazo.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/fonts/mathpazo/">browse</a>)
+<dt><tt><i>pxfonts</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/fonts/pxfonts.zip">fonts/pxfonts</a> (<a href="ftp://cam.ctan.org/tex-archive/fonts/pxfonts.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/fonts/pxfonts/">browse</a>)
+<dt><tt><i>txfonts</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/fonts/txfonts.zip">fonts/txfonts</a> (<a href="ftp://cam.ctan.org/tex-archive/fonts/txfonts.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/fonts/txfonts/">browse</a>)
+</dl>
+<p/><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=numbersets">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=numbersets</a>
+</body>