[Tex/LaTex] Rescaling `\check` symbol

Question

I would like to rescale \check symbol but not for the whole document. For example,

\documentclass{article}

\usepackage{mathtools}
\usepackage{asana-math}

\begin{document}

this is a normal \check symbol $\check{u}$, but in $\check{U}$ 
I want the check symbol to be larger

\end{document}

Answer 1

The mathabx package provides a \widecheck macro.

Since I don't have the asana-math package on my system, the following example uses LuaLaTeX and the unicode-math package to specify Asana Math as the OpenType math font.

\documentclass{article}
\usepackage{mathabx} % for '\widecheck' macro
\usepackage{unicode-math}
\setmathfont[Scale=MatchLowercase]{Asana Math}
\begin{document}
$\check{u}$ $\widecheck{U}$
\end{document}