Re: Using other TeX packages in Texinfo?

[Karl Berry]

    How do I use LaTeX macros, such as math typesetting, or any other TeX
    package inside a Texinfo file?

In general, there is no way to use LaTeX packages within Texinfo.
Texinfo is built on plain, not on LaTeX.  Sorry.

As far as math goes, you can say @math{...} and use any of the plain TeX
math constructs for inline math.  There is currently no separate command for
displayed equations, although @display @math{...} @end display is a
(mediocre) approximation.

Perhaps sometime in the future makeinfo will output LaTeX, but that is
far off.

Hope this helps.