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On the canonicity of Sahlqvist identities. (English) Zbl 0810.03050

Summary: We give a simple proof of the canonicity of Sahlqvist identities, using methods that were introduced in a paper by the author and A. Tarski [Am. J. Math. 73, 891-939 (1951; Zbl 0045.315)].

MSC:

03G25 Other algebras related to logic
03B45 Modal logic (including the logic of norms)
06E25 Boolean algebras with additional operations (diagonalizable algebras, etc.)

Citations:

Zbl 0045.315
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References:

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