AMS-LaTeX is a collection of LaTeX document classes and packages developed for the American Mathematical Society (AMS). Its additions to LaTeX include the typesetting of multi-line and other mathematical statements, document classes, and fonts containing numerous mathematical symbols. It has largely superseded the plain TeX macro package AMS-TeX. AMS-TeX was originally written by Michael Spivak, and was used by the AMS from 1983 to 1985. MathJax supports AMS-LaTeX through extensions. The following code of the LaTeX2e produces the AMS-LaTeX logo: The package has a suite of facilities to format multi-line equations. For example, the following code, causes the equals signs in the two lines to be aligned with one another, like this: AMS-LaTeX also includes many flexible commands for formatting and numbering theorems, lemmas, etc. For example, one may use the environment theorem to generate Theorem (Pythagoras) Suppose ''are the side-lengths of a right triangle. Then'' a^2+b^2=c^2. Proof. . . □