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Superposition for Lambda-Free Higher-Order Logic

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arxiv 2005.02094 v4 pith:SNADJSOI submitted 2020-05-05 cs.LO cs.AI

Superposition for Lambda-Free Higher-Order Logic

classification cs.LO cs.AI
keywords higher-ordercalculilogiccompletefreelambdasuperpositionallow
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We introduce refutationally complete superposition calculi for intentional and extensional clausal $\lambda$-free higher-order logic, two formalisms that allow partial application and applied variables. The calculi are parameterized by a term order that need not be fully monotonic, making it possible to employ the $\lambda$-free higher-order lexicographic path and Knuth-Bendix orders. We implemented the calculi in the Zipperposition prover and evaluated them on Isabelle/HOL and TPTP benchmarks. They appear promising as a stepping stone towards complete, highly efficient automatic theorem provers for full higher-order logic.

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