Lexicon of Arguments

 Philosophical and Scientific Issues in Dispute
 
[german]


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Theses I
Theses II

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I 82f
Presupposition/(Law of the) Excluded Middle/Geach: alleged counter-example against the sentence of the excluded middle: For example, from something that is not an animal, one might assume that it is neither true nor false that it is hungry.
So the predicate "animal" is presupposed.
>Cf. >Counterfactual conditional.
Geach: presupposition is quite different from entailment: if "hungry" entails "animal" then: "non-animal" entails "not-hungry". - Problem: from a thing "not animal" would at the same time be hungry/non-hungry.
>Entailment/Geach.
Def hungry/terminology/Geach: true of all that is hungry.
Def not-hungry/terminology/Geach: true of everything of which "not-hungry" is true and "animal" is not true.
((s) So no object since they cannot be "not-hungry".)
Geach: this eliminates categorical differences of "hungry" and "animal".
>Categories, >Categorization.
>Terminology/Geach.

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