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Solutions to Puzzles of Existential Generalisation

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RACLAVSKÝ Jiří

Rok publikování 2022
Druh Další prezentace na konferencích
Fakulta / Pracoviště MU

Filozofická fakulta

Citace
Popis The present paper addresses several puzzles related to the Rule of Existential Generalization, (EG). In solution to these puzzles, I clearly distinguish (EG) from a modified Rule of Existential Quantifier Introduction, which is derivable from (EG). Both these rules are often confused and both are considered as primitive. But I show that (EG) itself is derivable from the proper Rule of Existential Quantifier Introduction. The latter rule must be primitive in logical systems that treat both total and partial functions, for the universal and the existential quantifiers are not interdefinable in them. An appropriate natural deduction for such a system is deployed. It utilises an adequate definition of substitution which is capable of handling not only a higher-order quantification, but also (hyper)intensional contexts.
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