Abstract

Prover: We facilitate modal theorem proving in a first-order resolution calculus implemented in SPASS Version 0.77 [4]. SPASS uses ordered resolution and ordered factoring, it supports splitting and branch condensing (splitting amounts to case analysis while branch condensing resembles branch pruning in the Logics Workbench), it has an extensive set of reduction rules including tautology deletion, subsumption and condensing, and it supports dynamic sort theories by additional inference and reduction rules.

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