[OS X TeX] \overleftrightarrow

Michael Sharpe msharpe at ucsd.edu
Wed Nov 6 03:43:18 CET 2013

On Nov 1, 2013, at 3:20 PM, juan tolosa <juantolo at me.com> wrote:

> LaTeX has a neat control sequence, \overleftrightarrow, which puts a double arrow on top of characters. 
> This is missing in plain TeX. 
> Does anyone know of a similar object in plain TeX?
> Thanks,
>                Juan

That's in fact an AMS command, not a basic LaTeX command. In LaTeX, that's usually loaded with \usepackage{amsmath}, but the command may also found in amstex.sty which can be loaded by Plain TeX.

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