答案1
奇怪的选择。然而,大部分文本字体选择cmbright.sty
只有三行。
\documentclass{article}
%%% from cmbright.sty
\renewcommand{\familydefault}{\sfdefault}
\renewcommand{\sfdefault}{cmbr}
\renewcommand{\ttdefault}{cmtl}
\newtheorem{theorem}{Theorem}
\begin{document}
\begin{theorem}
A great theorem
\end{theorem}
Here is the proof
\[
f(x)=\sum_{n=0}^{\infty}\biggl(
\frac{(-1)^{n} x^{2n}}{\Gamma(2n+1)}
\prod_{k=2}^{\infty}(2k-1)
\biggr)
\]
\end{document}