texinfo: Inserting Math

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14.6 '@math': Inserting Mathematical Expressions
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You can write a short mathematical expression with the '@math' command.
Write the mathematical expression between braces, like this:

     @math{(a + b)(a + b) = a^2 + 2ab + b^2}

This produces the following in Info and HTML:

     (a + b)(a + b) = a^2 + 2ab + b^2

  The '@math' command has no special effect on the Info and HTML output.
'makeinfo' expands any @-commands as usual, but it does not try to
produce good mathematical formatting in any way.

  However, as far as the TeX output is concerned, plain TeX mathematical
commands are allowed in '@math', starting with '\', and the plain TeX
math characters like '^' and '_' are also recognized.  In essence,
'@math' drops you into plain TeX math mode.

  This allows you to conveniently write superscripts and subscripts (as
in the above example), and also to use all the plain TeX math control
sequences for symbols, functions, and so on, and thus get proper
formatting in the TeX output, at least.

  It's best to use '\' instead of '@' for any such mathematical
commands; otherwise, 'makeinfo' will complain.  On the other hand,
'makeinfo' allows input with matching (but unescaped) braces, such as
'k_{75}', although it complains about such bare braces in regular input.

  Here's an example:

     @math{\sin 2\pi \equiv \cos 3\pi}

which looks like the input in Info and HTML:
     \sin 2\pi \equiv \cos 3\pi

  Since '\' is an escape character inside '@math', you can use '@\' to
get a literal backslash ('\\' will work in TeX, but you'd get the
literal two characters '\\' in Info).  '@\' is not defined outside of
'@math', since a '\' ordinarily produces a literal (typewriter) '\'.
You can also use '@backslashchar{}' in any mode to get a typewriter
backslash.  Note: Inserting a Backslash.

  For displayed equations, you must at present use TeX directly (Note:
Raw Formatter Commands).