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Autor:
Weng Kin San
Publikováno v:
Mind.
kk states that knowing entails knowing that one knows, and K¬K states that not knowing entails knowing that one does not know. In light of the arguments against kk and K¬K, one might consider modally qualified variants of those principles. Accordin
Autor:
Weng Kin San
Publikováno v:
The Journal of Philosophy. 117:5-29
Fitch’s Paradox shows that if every truth is knowable, then every truth is known. Standard diagnoses identify the factivity/negative infallibility of the knowledge operator and Moorean contradictions as the root source of the result. This paper gen
Autor:
Weng Kin San
Publikováno v:
Journal of Philosophical Logic. 48:1003-1016
Augment the propositional language with two modal operators: □ and ■. Define \(\blacklozenge \) to be the dual of ■, i.e. \(\blacklozenge \equiv \neg \blacksquare \neg \). Whenever (X) is of the form φ → ψ, let (X\(^{\blacklozenge } \) ) be