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.[1]
It has largely superseded the plain TeX macro package AMS-TeX.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.
The package has a suite of facilities to format multi-line equations. For example, the following code,
\begin{align}
y &= (x+1)^2 \\&= x^2+2x+1
\end{align}
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
\begin{theorem}[Pythagoras] Suppose $a\leq b\leq c$ are the side-lengths of a right triangle.\\ Then $a^2+b^2=c^2$.\end{theorem}\begin{proof}. . . \end{proof}
to generate
Theorem (Pythagoras) Supposeare the side-lengths of a right triangle. Then. Proof. . . □
