Psychology Dictionary of ArgumentsHome
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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._____________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. | |||
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Peter Geach on Equivalence - Dictionary of Arguments
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._____________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. |
Gea I P.T. Geach Logic Matters Oxford 1972 |
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> Counter arguments against Geach
> Counter arguments in relation to Equivalence
