答案1
答案2
像这样,使用来自的研磨命令stackengine
?
\documentclass{article}
\usepackage{stackengine}
\newcommand\isom{\mathrel{\stackon[-0.1ex]{\makebox*{\scalebox{1.08}{\AC}}{=\hfill\llap{=}}}{{\AC}}}}
\newcommand\nvisom{\rotatebox[origin=cc] {-90}{$ \isom $}}
\newcommand\visom{\rotatebox[origin=cc] {90} {$ \isom $}}
\begin{document}
\[ A \stackMath\brlap[1.4ex]{\scriptstyle\rightarrow k+1}r = B\]%
\end{document}