Sahlqvist Formula - Examples of Sahlqvist Formulas

Examples of Sahlqvist Formulas

Its first-order corresponding formula is, and it defines all reflexive frames
Its first-order corresponding formula is, and it defines all symmetric frames
or
Its first-order corresponding formula is, and it defines all transitive frames
or
Its first-order corresponding formula is, and it defines all dense frames
Its first-order corresponding formula is, and it defines all right-unbounded frames (also called serial)
Its first-order corresponding formula is, and it is the Church-Rosser property.

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