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When Lawvere meets Peirce: an equational presentation of boolean hyperdoctrines (2404.18795v1)
Published 29 Apr 2024 in math.CT and cs.LO
Abstract: Fo-bicategories are a categorification of Peirce's calculus of relations. Notably, their laws provide a proof system for first-order logic that is both purely equational and complete. This paper illustrates a correspondence between fo-bicategories and Lawvere's hyperdoctrines. To streamline our proof, we introduce peircean bicategories, which offer a more succinct characterization of fo-bicategories.