A Sound and Complete Axiomatic System for Modality ◻ϕ≡◻1ϕ∧◻2ϕ
Abstract
An axiomatic system is presented in this paper, which has a modal operator □ such that ◻ϕ≡◻1ϕ∧◻2ϕ, where □1 and □2 are the modal operators of the language for the axiom system S5. The axiomatic system for □ is proved to be sound and complete.
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