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From: Athel Cornish-Bowden <me@yahoo.com>
Newsgroups: comp.text.tex
Subject: Re: Double harpoons?
Date: Fri, 6 Sep 2024 12:19:41 +0200
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On 2024-09-06 09:28:22 +0000, db said:

> I want to write a reversible chemial reaction using
> what I call double harpoons, but they don't seem to
> exist in LaTeX. Or do they? Using \longdoublearrows
> doesn't quite make it.

I have felt the same need and the same frustration at not finding a 
good solution.

What I do is

\newcommand {\reversible}{\hspace*{-0.08cm}\begin{array}{c}
_\rightarrow\\[-0.17cm]
^\leftarrow\\
\end{array}\hspace*{-0.08cm}}

This does what I want, but not necessarily what you want.


-- 
Athel -- French and British, living in Marseilles for 37 years; mainly 
in England until 1987.