The package's basic command is \ifthenelse, which can use a wide array of tests. Also provided is a simple loop command \whiledo.
Ifthen is a separate package within the LaTeX distribution; while it will always be present in a LaTeX distribution, a \usepackage command is always needed to load it.
See also xifthen.
The authors are Leslie Lamport and David Carlisle.
License: lppl Catalogued: 2009-09-29