答案1
请参阅下面的大 DELTA 的代码。
\documentclass{article}
\usepackage{amsfonts}
\newcommand{\bigdelta}{\raisebox{-.35\baselineskip}{\huge\ensuremath{\Delta}}}
\newcommand{\bigdeltab}{\makebox{\huge\ensuremath{\Delta}}}
\begin{document}
So this is the very big $\bigdelta$ what you want. And it act between lines like:
\[\bigdelta x=mn=\prod=0.\]
And we can we have another kind of big $\bigdeltab$ which acts between lines like:
\[\bigdeltab x=mn=\prod=0.\]
\end{document}
编译后的 PDF 为