Peirce’s Triadic Logic and Its (Overlooked) Connexive Expansion

Logic and Logical Philosophy:1 (forthcoming)
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In this paper, we present two variants of Peirce’s Triadic Logic within a language containing only conjunction, disjunction, and negation. The peculiarity of our systems is that conjunction and disjunction are interpreted by means of Peirce’s mysterious binary operations Ψ and Φ from his ‘Logical Notebook’. We show that semantic conditions that can be extracted from the definitions of Ψ and Φ agree (in some sense) with the traditional view on the semantic conditions of conjunction and disjunction. Thus, we support the conjecture that Peirce’s special interest in these operations is due to the fact that he interpreted them as conjunction and disjunction, respectively. We also show that one of our systems may serve as a suitable base for an interesting implicative expansion, namely the connexive three-valued logic by Cooper. Sound and complete natural deduction calculi are presented for all systems examined in this paper.



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Alexander Belikov
Moscow State University

Citations of this work

A Variant of Material Connexive Logic.Alexander Belikov & Dmitry Zaitsev - 2022 - Bulletin of the Section of Logic 51 (2):227-242.
Infectious and transparent emotivism.Jeremiah Joven Joaquin - 2021 - Journal of Applied Non-Classical Logics 32 (1):1-10.

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