System Description: IVY

IVY is a veriied theorem prover for rst-order logic with equality. It is coded in ACL2, and it makes calls to the theorem prover Otter to search for proofs and to the program MACE to search for coun-termodels. Veriications of Otter and MACE are not practical because they are coded in C. Instead, Otter and MACE give detailed proofs and models that are checked by veriied ACL2 programs. In addition, the initial conversion to clause form is done by veriied ACL2 code. The veriication is done with respect to nite interpretations.