Independence of the Dual Axiom in Modal $mathbf{K}$ with Primitive $lozenge$

Notre Dame Journal of Formal Logic 59 (3):381-385 (2018)
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Abstract

Explicit axioms relating ◊ϕand □ϕ appear to be needed if ◊ is taken to be primitive. We prove that such axioms are in fact indispensable.

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10.1215/00294527-3817906

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Richmond Thomason
University of Michigan, Ann Arbor

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