A LaTeX document class for articles that is tailored to the design of American Mathematical Society journals. If you have a standard installation of LaTeX, you should find that amsart is already present because it is included in the AMS-LaTeX distribution.

For publication-specific AMS document classes (jams-l.cls, bull-l.cls, tran-l.cls, proc-l.cls, mcom-l.cls, etc.), see the AMS author information.

The author is The American Mathematical Society.