[OS X TeX] \overleftrightarrow

[juan tolosa]

How do you load amstex.sty by Plain TeX?
I tried

\input amstex.sty

but it didn't work.

Thanks,
                  Juan

On Nov 5, 2013, at 9:43 PM, Michael Sharpe wrote:

> 
> 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.
> 
> 
> Michael
> 
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