LaTeX Special Arrow Symbol

Question

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.

Answer 1

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.