I'd like to use \v{C} as a math operator. However, if I write $\v{C}_r(S)$ or define \DeclareMathOperator{\Cech}{\v{C}}, the \v{C} symbol does not get shown at all. What is the proper way to handle this?
[Tex/LaTex] How to use a special character as a math operator
math-modemath-operators
Related Solutions
Here's a slightly different version: I apply the shortening on both sides, for symmetry.
The shorthening depends on the value given to the parameter \uHomskip.
\documentclass{article}
\usepackage{amsmath}
\newmuskip\uHomskip
\DeclareMathOperator{\uHom}{%
\mkern\uHomskip
\underline{\mkern-\uHomskip Hom\mkern-\uHomskip}
\mkern\uHomskip
}
\begin{document}
\newcommand{\test}[1]{%
\begingroup\uHomskip=#1mu\relax
\makebox[2em][l]{#1:}$\uHom_R$
\endgroup\par
}
\test{0} \test{0.5} \test{1} \test{1.5} \test{2}
\end{document}
When you decide for the amount you want, just set it in the preamble, for instance
\newmuskip\uHomskip \setlength{\uHomskip}{1.5mu}
\DeclareMathOperator{\uHom}{%
\mkern\uHomskip
\underline{\mkern-\uHomskip Hom\mkern-\uHomskip}
\mkern\uHomskip
}
The advantage of using mu units is that they automatically scale in subscripts/superscripts.
If you don't want the shortening at the left, just remove the relevant kerns:
\newmuskip\uHomskip \setlength{\uHomskip}{1.5mu}
\DeclareMathOperator{\uHom}{%
\underline{Hom\mkern-\uHomskip}
\mkern\uHomskip
}
Best Answer
\v(C)only works outside maths mode. For inside maths mode, use\check{C}. Thus (providing you are using theamsmathormathtoolspackages), create your operator using:and you can then do
$\Cech_r(S)$to get what you want.