I want to get a italic type \Sigma, just like
,but if I can use \mathit to get it.
This is my code.
\documentclass{ctexart}
\usepackage{amsmath}
\begin{document}
$$\Sigma$$
a
$$\mathit{\Sigma}$$
b
\end{document}
Hope that someone can help me to solve this problem.
\mathit,\Sigmawill disappear – jiawei Oct 14 '21 at 07:13$$...$$this is not LaTeX syntax. – daleif Oct 14 '21 at 07:20\Sigmato give the italic version without having to type\mathit? – campa Oct 14 '21 at 07:36\Sigma, but I don't know to get it. – jiawei Oct 14 '21 at 08:07