# Problem with "check" notation and "bold mathcal" font

I am trying to use the \check notation for \boldsymbol{\mathcal A}, but it does not appear in the right place; please see below for a minimal code and comparison with ordinary A and ordinary \mathcal{A}. Does anyone know how to fix this problem? Thanks.

\documentclass{article}
\usepackage{amsmath}
\usepackage{amssymb}

\begin{document}

\begin{align*}
\check{A}\\
\check{\mathbf A}\\
\check{\mathcal A}\\
\boldsymbol{\check{\mathcal{A}}}\\
\check{\boldsymbol{\mathcal A}}
\end{align*}

\end{document}


• Wouldn't you want \boldsymbol{\check{\mathcal{A}}} instead? Aug 14 '15 at 22:01
• Thanks. It works, but it makes the "check" symbol also bold. I prefer not to have the check symbol in bold. Aug 14 '15 at 22:08

For automatic correct positioning, you should define a new math alphabet:

\documentclass{article}
\usepackage{amsmath}
\usepackage{amssymb}

\DeclareMathAlphabet{\mathbcal}{OMS}{cmsy}{b}{n}

\begin{document}
\begin{align*}
\check{A}\\
\check{\mathbf{A}}\\
\check{\mathcal{A}}\\
\check{\mathbcal{A}}
\end{align*}

\end{document}


• Could you please explain why it's necessary to define the new alphabet? Aug 14 '15 at 22:13
• @GonzaloMedina Because the \boldsymbol way creates a subformula and in this case TeX puts the accent centered over the subformula. It's the same as \check{abcdef}. Aug 14 '15 at 22:16
• I see. Thank you. You already had my +1 before the explanation :-) Aug 14 '15 at 22:18