Lexicon of Arguments

 Philosophical and Scientific Issues in Dispute
 
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I 189f
Equivalence/Biconditional/GeachVsBlack: "is materially equivalent" is not synonymous with "if and only if".
>Equivalence.
"Three line" symbol ≡ is often read as "materially equivalent". But equivalence exists only between sentences, not names of sentences.
Problem: Tom loves Mary ↔ Mary loves Tom" is only significant if "≡" (thee line) is read as "iff" (if and only if) rather than "materially equivalent".(⇔)
cf. >Material, >Formal, >Description level, >Content, cf. >Formalism, >Formal language, >Formal speech, >Conditional.

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