Canonical Pseudo-Correspondence
نویسنده
چکیده
Generalizing an example from (Fine 1975) and inspired by a theorem in (Jónsson 1994), we prove that any modal formula of the form π(p ∨ q) ↔ π(p) ∨ π(q) (with π(p) a positive formula) is canonical. We also prove that any such formula is strongly sound and complete with respect to an elementary class of frames, definable by a first order formula which can be read off from π.
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