Philosophy Dictionary of Arguments

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Equivalence: Relation between sentences. It exists if both sides have the same truth value, so that they are both true or both false.
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Annotation: The above characterizations of concepts are neither definitions nor exhausting presentations of problems related to them. Instead, they are intended to give a short introduction to the contributions below. – Lexicon of Arguments.

 
Author Concept Summary/Quotes Sources

M.J. Cresswell on Equivalence - Dictionary of Arguments

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".
>Intensionality
, >Intensions.
Problem: the attribution of propositional attitudes changes the truth value.
>Truth values, >Propositional attitudes.
II 82
Many ordinary intensional but equivalent singular terms can be replaced.
>Singular terms.
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 - (parts or whole).
>That-clause, >That/Cresswell.

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Explanation of symbols: Roman numerals indicate the source, arabic numerals indicate the page number. The corresponding books are indicated on the right hand side. ((s)…): Comment by the sender of the contribution. Translations: Dictionary of Arguments
The note [Concept/Author], [Author1]Vs[Author2] or [Author]Vs[term] resp. "problem:"/"solution:", "old:"/"new:" and "thesis:" is an addition from the Dictionary of Arguments. If a German edition is specified, the page numbers refer to this edition.

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

Cr II
M. J. Cresswell
Structured Meanings Cambridge Mass. 1984


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Ed. Martin Schulz, access date 2024-04-20
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