The language
is described in the book *The Joy of X*. is a macro package, not a modification
to the source program, so all the capabilities described in **tex**(1)
are
present.

The macros encourage writers to think about the content of their documents, rather than the form. The ideal, not always realized, is to have no formatting commands (like ``switch to italic'' or ``skip 2 picas'') in the document at all; instead, everything is done by specific markup instructions: ``emphasize'', ``start a section''.

is the official typesetting system of the American Mathematical Society, and nearly all of its publications are typeset using . The online version of AMS Math Reviews uses input syntax for display of mathematical material. AMS authors can provide editors with computer-readable files.

For authors more familiar with **X, an AMS-supported
package called amsmath.sty is is available. **

*amsguide.tex"*- Documentation for , typesettable by .
*amfndoc.tex"*- Documentation for AMS fonts, typesettable by .

Michael Spivak,