SAT-based Finite Model Generation for Higher-Order Logic
Tjark Weber · mediaTUM – the media and publications repository of the Technical University Munich (Technical University Munich) · 2008
This thesis presents two extensions to the theorem prover Isabelle/HOL, a logical framework based on higher-order logic. The main contribution is a model generator for higher-order logic that proceeds by translating the input formula to propositional logic, so that a standard SAT solver can be employed for the actual model search. The translation is proved correct. The model generator has been integrated with the Isabelle system, extended to support some of the definitional mechanisms provided by Isabelle/HOL, and applied to various case studies. Moreover, SAT solvers have been integrated with Isabelle in a proof-producing fashion: propositional tautologies can be proved by a SAT solver, and the resolution proof found by the solver is verified by Isabelle. An adequate representation of the problem allows to verify proofs with millions of resolution steps.