texlive-latex-amsmath 51265 AMS mathematical facilities for LaTeX
This is the principal package in the AMS-LaTeX distribution. It adapts for use in LaTeX most of the mathematical features found in AMS-TeX; it is highly recommended as an adjunct to serious mathematical typesetting in LaTeX. When amsmath is loaded, AMS-LaTeX packages
amsbsyamsbsy (for bold symbols),
amsopnamsopn (for operator names) and
amstextamstext (for text embedded in mathematics) are also loaded. This package is part of the LaTeX required distribution; however, several contributed packages add still further to its appeal; examples are
empheqempheq, which provides functions for decorating and highlighting mathematics, and
ntheoremntheorem, for specifying theorem (and similar) definitions.