I am using the acmsmall template and my inline formulas are being broken at equal signs and arrows; how can I prevent them from being typeset like that globally (i.e. without having to put tildes everywhere)?


  • Possible duplicate: tex.stackexchange.com/questions/10850/…
    – diabonas
    Mar 25, 2011 at 14:49
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    @diabonas: Good that you found that question. But here it's about avoiding these line breaks globally. The answers to that other question don't address this. Mar 25, 2011 at 14:52
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    I added globally to the title, so that is clearer
    – NoWhereMan
    Mar 25, 2011 at 15:14
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    Does this answer your question? Stop LaTeX from breaking an inline math equation
    – cabohah
    Apr 16, 2023 at 18:32
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    @cabohah Duplicate answers doesn't make duplicate questions. With duplicates, the principle is to think about someone searching for the question afresh. That person might well distinguish between a solution that works globally as to one that works on an individual question. There could be a third question that clearly asks both versions of the question, in which case each of these could be closed as a duplicate of that (it's not uncommon for these meta-questions to be asked), but given how old these questions are then I'd leave well alone. Apr 16, 2023 at 18:55

3 Answers 3


Increase the penalty for line breaks at relation symbols and binary operators:


If you simply include these commands in your preamble (between \documentclass{...} and \begin{document}), it will prevent line breaks in most cases, but in extreme situations, they can still be broken. If you set


equations will never be broken - this may, however, destroy your layout!

  • wonderful, that seems to have done the trick, thank you!
    – NoWhereMan
    Mar 25, 2011 at 15:07

\mbox{$equation$} is not an answer, unfortunately: the spacing in the equation doesn't grow or shrink together with the other spaces in the line. The "correct" answer is

$LHS=\nobreak RHS$

TeX will choose another break point, if there is one, or warn about an Overfull \hbox

Diabonas's answer shows how to avoid such breaks globally, and correctly warns about the dangers of doing so.


I found the easiest way to simply wrap the equation within curly brackets preceded by a tilde. See the example below.

Instead of

$x = \{x\,|\,x\in\mathbb{R_{\ge0}}\}$

you would write

$~{x = \{x\,|\,x\in\mathbb{R_{\ge0}}\}}$

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