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I just want to get only $\left \{$ in "Spec math version", all inside and outside have to be back to "OK version". My attempt:

\documentclass[a4paper,openany,12pt]{amsbook}
\usepackage[math]{iwona}
\DeclareMathVersion{OK}
\SetSymbolFont{operators}{OK}{OT1}{cmr}{m}{it}
\SetSymbolFont{letters}{OK}{OML}{cmbrm}{m}{it}
\SetSymbolFont{symbols}{OK}{OMS}{cmbrs}{m}{it}
\SetSymbolFont{largesymbols}{OK}{OMX}{iwona}{m}{it}
%--------------------------------------------------------
\DeclareMathVersion{Spec}
\SetSymbolFont{largesymbols}{Spec}{OMX}{cmbrs}{m}{it}
%--------------------------------------------------------
\newcommand{\va}[2]{\mathversion{Spec}\ensuremath{\left \{ \mathversion{OK} \begin{array}{l}
            {#1} \\
            {#2}
    \end{array}} \right.}
\begin{document}
    \mathversion{OK}
    \[\forall x,y: \va{x + y = 0}{x - y = 0} \Rightarrow x = y = 0 \]
\end{document}

The inner portion is corrected, but the outer portion still contains problematic formatting. I'm unsure how to properly fix it - could you please assist?

Chau Long
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    Try to move \right. inside of \ensuremath. So that \left\{ and \right. are at the same level. – Piroooh Sep 27 '23 at 05:43
  • don't ignore warnings!!!! LaTeX Font Warning: Command \mathversion invalid in math mode on input line 18. you can not use \mathversion in this way. – David Carlisle Sep 27 '23 at 07:08
  • You could declare a separate extension font in the OK mathversion and use that, but cmbright doesn't have an extension font with large brackets as far as I can see – David Carlisle Sep 27 '23 at 07:22

1 Answers1

3

Don't ignore warnings!!!!

LaTeX Font Warning: Command \mathversion invalid in math mode on input line 18.

you can not use \mathversion in this way.

You could declare a separate extension font in the OK mathversion and use that, but cmbright doesn't have an extension font with large brackets as far as I can see, this is using computer modern {

enter image description here

\documentclass[a4paper,openany,12pt]{amsbook}
\usepackage[math]{iwona}
\DeclareMathVersion{OK}
\SetSymbolFont{operators}{OK}{OT1}{cmr}{m}{n}
\SetSymbolFont{letters}{OK}{OML}{cmbrm}{m}{it}
\SetSymbolFont{symbols}{OK}{OMS}{cmbrs}{m}{n}
\SetSymbolFont{largesymbols}{OK}{OMX}{iwona}{m}{n}
%--------------------------------------------------------

\DeclareSymbolFont{symbolsx}     {OMS}{cmsy}{m}{n}
\DeclareSymbolFont{largesymbolsx}{OMX}{cmex}{m}{n}
\DeclareMathDelimiter{\xlb}
   {\mathopen}{symbolsx}{"66}{largesymbolsx}{"08}


%--------------------------------------------------------
\newcommand{\va}[2]{\left\xlb\begin{array}{l}
            {#1} \
            {#2}
    \end{array} \right.}
\begin{document}
    \mathversion{OK}
    [\forall x,y: \va{x + y = 0}{x - y = 0} \Rightarrow x = y = 0 ]
\end{document}
David Carlisle
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