Philosophy Lexicon of Arguments

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Law of the Excluded Middle: an assertion is either true or false. "There is no third possibility."See also bivalence, anti-realism, multivalued logic.

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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.

 
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I 76ff
Law of excluded middle / Geach: valid without any exception - even Aristotle 9 Chap. De Interpretatione: tomorrow s sea battle: no refutation - no multi-valued logic: if we get the same truth value, if we ascribe P and its negation, then if P u P and P v P - the same as for simple predication - Geach: only exception: vagueness.


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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.

Gea I
P.T. Geach
Logic Matters Oxford 1972


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Ed. Martin Schulz, access date 2017-11-22