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I apologize if this question is very similar to others, but the other solutions have not worked for me. I am using plain TeX, and trying to make the math in my section titles bold. Any help would be greatly appreciated.

  • 2
    Welcome to TeX.SX! Instead of just stating that other solutions didn't work for you, it would be better to also show what you have tried. – siracusa Sep 10 at 1:29
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Set up the math fonts for the bold version.

\font\tenib=cmmib10
\font\sevenib=cmmib7
\font\fiveib=cmmib5
\font\tensyb=cmbsy10
\font\sevensyb=cmbsy7
\font\fivesyb=cmbsy5
\font\tenexb=cmexb10

\def\boldmath{%
  \textfont0=\tenbf \scriptfont0=\sevenbf \scriptscriptfont0=\fivebf
  \textfont1=\tenib \scriptfont1=\sevenib \scriptscriptfont1=\fiveib
  \textfont2=\tensyb \scriptfont2=\sevensyb \scriptscriptfont2=\fivesyb
  \textfont3=\tenexb \scriptfont3=\tenexb \scriptscriptfont3=\tenexb
}

\catcode`@=11
\outer\def\beginsection#1\par{\vskip\z@ plus.3\vsize\penalty-250
  \vskip\z@ plus-.3\vsize\bigskip\vskip\parskip
  \message{#1}\leftline{\bf\boldmath#1}\nobreak\smallskip\noindent}
\catcode`@=12

Some text and a formula $a+\sum_i a_i\otimes c$

\beginsection Some text and a formula $a+\sum_i a_i\otimes c$

Some text and a formula $a+\sum_i a_i\otimes c$

\bye

enter image description here

  • Argh: \outer!!! – Joseph Wright Sep 10 at 8:37
  • @JosephWright Would you dispute Knuth's authority? ;-) – egreg Sep 10 at 8:44
  • 2
    Hans introduced \frozen in LuaMetaTeX. That's going to be the new \outer. – Henri Menke Sep 10 at 8:47
  • Knuth did provide \pmb on page 386 of the TeXbook. It's not part of TeX or even listed in the index (except under boldface). – John Kormylo Sep 10 at 16:30
  • @JohnKormylo That's only for real emergencies. – egreg Sep 10 at 17:03

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