Why is a software verification platform that applies formal proving
tools to annotated programs. It is currently capable of analysis of C
(through the included tool "Caduceus"), Java (through the included
tool "Krakatoa"), and potentially ML programs with some modification
into Why's own ML-like language. Furthermore, Why is capable of
analysis of any program that is mapped onto its own internal
language. It uses a weakest precondition involving calculus to
generate potential theorems necessary for the proof of a program's
correctness. It translates these theorems into formats that can be
used by external proof assistants (without any extra work, Coq, PVS,
HOL Light, Mizar are supported - having one is recommended and Coq is
packaged for Fedora) and automated theorem provers (without any extra
work, Simplify, Alt-Ergo, Yices, Z3, CVC Lite, Zenon are supported and
Zenon is packaged for Fedora) so that these results can be externally
proven, resulting in a proof of program correctness.