Break an inline math formula

Question

I have a theorem that looks like this:

Now I would like to break the (A....D) math expression. The problem is, that nothing I did from the solution of this answer helped (since probably people will direct me to that answer), that is:

• breaking the math expression in two different math expression separated by a comma did nothing and if I added a \\ it broke the expression, but it looked ugly since the part on the second line wasn't aligned properly to the right
• \allowbreak did nothing

• adding

  \makeatletter
  \def\old@comma{,}
   \catcode`\,=13
   \def,{%
     \ifmmode%
       \old@comma\discretionary{}{}{}%
     \else%
       \old@comma%
     \fi%
   }
   \makeatother
  

caused an error, since I'm using TikZ where some parameters are separated by a comma.

Does someone know any other solution, please ?

Answer 1

Since it appears that the solution from Allowing line break at ',' in inline math mode? works for you, except that it causes problems elsewhere, you could restrict the redefinition of the comma character to be local to the paragraph where you are having this problem, by enclosing it in a brace group. Here I have applied this redefinition only to the second paragraph, and you can see that this redefinition is local.

Notes:

• The showframe package was used just to display the margins.

Code:

\documentclass{article}
\usepackage{showframe}

\begin{document}
Here is some very long text followed by a very long equation like $a,b,c,d,e,f,g,h,i,j,k,l$ etc

{
    \def\OldComma{,}
    \catcode`\,=13
    \def,{%
      \ifmmode%
        \OldComma\discretionary{}{}{}%
      \else%
        \OldComma%
      \fi%
    }%
Here is some very long text followed by a very long equation like $a,b,c,d,e,f,g,h,i,j,k,l$ etc.%
}

Here is some very long text followed by a very long equation like $a,b,c,d,e,f,g,h,i,j,k,l$ etc
\end{document}

Answer 2

Without a minimal example (that actually runs on its own) one can only guess, but my suspicion is that you use \left( A ... \right). If that is the case then nothing will break whatever you try, because the \left/\right construct will produce a sub-formula that is unbreakable.

The only solution in that case would be to not use \left/\right but \bigl and \bigr (or \biggl or whatever size you need for the parantheses). Then \allowbreak inside should work.

Answer 3

Add \penalty 0 (leave a space after the zero) after the comma where you want the break to be. This will add a suitable break point.

However, this should really be a last resort. Try and modify the paragraph to fit the formula better.