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Does anyone know how to typeset the arrow in the photo below? It is in Algebra: Chapter 0 by Paolo Aluffi, but I cannot find it anywhere.

enter image description here

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1 Answer

It looks like A \stackrel{\sim}{\to} B with the older arrows. Two identical options are below:

\documentclass{article}
\usepackage{amsmath}
\newcommand{\slippery}{\overset{\sim}{\to}}
\newcommand{\mapping}{\stackrel{\sim}{\to}}
\begin{document}
\begin{align}
A &\slippery B\\
A &\mapping B
\end{align}
\end{document}

where \overset belongs to amsmath. In case of confusion, I choose what amsmath offers for purely psychological reasons.

enter image description here

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