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HOL is a system for proving theorems in Higher Order Logic. It
comes with a large variety of existing theories formalising
various parts of mathematics and theoretical computer science.
A collection of machine-checkend mathematical proofs
The Archive of Formal Proofs is a collection of proof libraries, examples, and larger scientifc developments, mechanically checked in the theorem prover Isabelle. It is organized in the way of a scientific journal. Submissions are refereed.
A collection of modeling tools for system comprehension.
Includes
1) DEMOS2K - a semantically justified version of DEMOS
2) SAVANT - a tool for evaluating system availability
3) GOLDSTAR - an arbitrary reward calculation system.