一句话:提出新皮尔士关系演算,用弦图给出一阶逻辑表达力的二元关系演算及其完备公理化。
本文研究如何为具有一阶逻辑表达力的关系演算提供图解式公理化。作者引入“新皮尔士关系”(neo-Peircean relations),将经典二元关系演算扩展为弦图演算,并通过组合笛卡尔双范畴与线性双范畴这两类已知范畴结构来刻画其公理。该演算在表达力上等价于一阶逻辑,且给出的公理系统是完备的。论文因此为一阶逻辑提供了一种范畴化、图解化的代数呈现,也展示了双范畴结构在逻辑演算组织中的作用。
We introduce the calculus of neo-Peircean relations, a string diagrammatic extension of the calculus of binary relations that has the same expressivity as first order logic and comes with a complete axiomatisation. The axioms are obtained by combining two well known categorical structures: cartesian and linear bicategories.