I need to write a mathematical expression in a section title, for example this:
\section{$Al_{2}O_{3}$},
but in this case it will appear in a math style (in italic font.) I don't know how could I force the latex to write it normal as a normal text, (as a bold and not italic letter).
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1Answer: it depends on information you have chosen not to share. Please provide a minimal document which we can compile to reproduce what you see now. Discussion: this will greatly confuse your readers. I'm no mathematician but, as I understand it italic and upright have different semantic meanings. So do bold and normal weight. How, then, should your readers understand the expression?– cfrOct 10, 2015 at 21:30
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2 Answers
You can use \textsubscript{2} etc. for the indices.
\documentclass{article}
\usepackage{fixltx2e}` % for LaTeX older than early 2015
\usepackage{textcomp}
\begin{document}
\section{$Al_{2}O_{3}$}
\section{Al\textsubscript{2}O\textsubscript{3}}
\end{document}
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1@Hajnus: Normally, you don't need
fixltx2eany longer. The fixes from that package have been incorporated into the LaTeX core this year– user31729Oct 10, 2015 at 21:37 -
I don't know why, but when I tried it without this usepackage it didn't work.– AlízOct 10, 2015 at 21:39
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@Hajnus: Apparently you have an older LaTeX distribution. I will add the package to the solution– user31729Oct 10, 2015 at 21:40
This is not mathematics, but chemistry!
\documentclass{article}
\usepackage{chemformula}
\begin{document}
\section{\ch{Al2O3}}
\end{document}
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Yes, but in the general case it refer to a mathematics expression. Thank you for your answer.– AlízOct 10, 2015 at 21:48
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1@Hajnus If it's math, it should be typeset as math. Is the problem about boldface? Some styles make math bold in section titles (I wouldn't). In this case just do
\section{\protect\boldmath $x+y=z$}– egregOct 10, 2015 at 21:49