Philosophy Lexicon of Arguments

Equivalence: Relation between sentences. It exists if both sides have the same truth value, so that they are both true or both false.
Author Item Excerpt Meta data

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II 78f
Intensional Equivalence/Cresswell: one could replace "steal spoons" by the intensional equivalent substitute "steal spoons and either eat the cheese or not eat the cheese" - problem: the attribution of propositional attitudes changes the truth value.
II 82
Many ordinary intensional but equivalent singular terms can be replaced.
II 175
Equivalence/Propositional attitude/Cresswell: no logical equivalence can be assumed to be certain. - Therefore also no non-standard logic helps. - Not even for E.g. "Fred laughed and Betty laughed" can be interchanged in the sequence - (in belief contexts) - solution/Cresswell: different levels of sensitivity to the structure of the that-sentence - (part or whole).

Cr I
M. J. Cresswell
Semantical Essays (Possible worlds and their rivals) Dordrecht Boston 1988

M. J. Cresswell
Structured Meanings Cambridge Mass. 1984

> Counter arguments against Cresswell
> Counter arguments in relation to Equivalence

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Ed. Martin Schulz, access date 2017-05-24