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
Geach, Peter T.
Books on Amazon
Equivalence I 189f
Equivalence/Biconditional/GeachVsBlack "is material equi" is not synonymous with "if and only if" - (symbol with three lines) is often read as "materially equivalent" - equivalence only between sentences, not the names of sentences - Problem: "Tom loves Mary ↔ Mary loves Tom" is only significant if "↔" (three lines) is read as "iff" rather than "materially equi".

Gea I
P.T. Geach
Logic Matters Oxford 1972

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Ed. Martin Schulz, access date 2017-04-26