Philosophy Lexicon of Arguments

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Universal instantiation, logic: on the condition that all objects x have the property F, one can conclude that a particular object, which can be designated, has the property F. See also universal generalization, existential generalization.

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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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Books on Amazon
I 142f
UI / Geach: universal Instantiantiation: from (x) Fx to Fw. - IE: instantial existentiation: from Fw to (Ex) Fx - EI: existenial instantiation: from (Ex) Fx to Fw. - IU: Instantial universalization of Fw to (x) Fx, ((s), if any w is F, then everything is F?). - Geach: a proof with IU may be replaced by one which only uses EI. - IU and UI are valid also in not non-Shakespearean contexts. - (N-Shakesp: a rose would smell even if it were not be called a rose.


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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 2017-10-20