Clash between czech babel and chemacros in displaying reaction arrows, resulting in
chemformula error: "unknown-arrow"
The arrow type <-> doesn't exist on line 19.
If czech babel is switched of or spanish is used, it works.
How to make it work together? Repair it in similar way as done here?
Minimal working example:
\documentclass[a4paper,12pt]{article}
% \usepackage[spanish,es-noquoting]{babel} %all working with spanish babel
\usepackage[czech]{babel}
\usepackage{tikz}
\usetikzlibrary{arrows}
\usepackage{chemmacros}
\chemsetup{modules=all}
\chemsetup{formula=chemformula}
\begin{document} <<Test>>
\ch{1 glucosa_{(s)} <=>> glucosa_{(aq)}} %working
\ch{2 glucosa_{(s)} <-> glucosa_{(aq)}} %not working
\ch{3 glucosa_{(s)} -> glucosa_{(aq)}} %not working
\begin{reaction} 4 glucosa_{(s)} <=> glucosa_{(aq)} %working \end{reaction}
\begin{reaction} 5 glucosa_{(s)} <-> glucosa_{(aq)} %not working
\end{reaction}
<<Test>>
\end{document}
Similar issues:
-is made active byczechbabel, which you have to deactivate it when using these chemmacros commands. A catch-all solution is just to use\shorthandoff{-}before you use these\chetc., and you can reactivate the shorthand with\shorthandon{-}after you're done.