What is "ams-latex"

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It has largely superseded the plain TeX macro package AMS-TeX.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.

The following code of the LaTeX2e produces the AMS-LaTeX logo :

%%% -- AMS-LaTeX_logo.tex ------- \documentclass{article} \usepackage{amsmath} \begin{document} \AmS-\LaTeX \end{document}

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:

$$\begin{align} y &= (x+1)^2 \\ &= x^2+2x+1 \end{align}$$

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) Suppose a ≤ b ≤ c ''are the side-lengths of a right triangle. ''
Then a + b = c.
Proof. . . □