Mathtools provides a series of packages designed to enhance the appearance of
documents containing a lot of mathematics. The main backbone is amsmath, so
those unfamiliar with this required part of the LaTeX system will probably not
find the packages very useful. Mathtools provides many useful tools for
mathematical typesetting. It is based on amsmath and fixes various deficiencies
of amsmath and standard LaTeX. It provides: Extensible symbols, such as
brackets, arrows, harpoons, etc.; Various symbols such as \coloneqq (:=); Easy
creation of new tag forms; Showing equation numbers only for referenced
equations; Extensible arrows, harpoons and hookarrows; Starred versions of the
amsmath matrix environments for specifying the column alignment; More building
blocks: multlined, cases-like environments, new gathered environments; Maths
versions of \makebox, \llap, \rlap etc.; Cramped math styles; and more...
Mathtools requires mhsetup.
