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@proceedings{1840797, author = {Raclavský, Jiří}, booktitle = {10th Non-Classical Logic. Theory and Application (NCL'22)}, keywords = {existential generalisation; quantifying in; explicit substitution;partial type logic; natural deduction}, language = {eng}, title = {Solutions to Puzzles of Existential Generalisation}, year = {2022} }
TY - CONF ID - 1840797 AU - Raclavský, Jiří PY - 2022 TI - Solutions to Puzzles of Existential Generalisation KW - existential generalisation KW - quantifying in KW - explicit substitution;partial type logic KW - natural deduction N2 - 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. ER -
RACLAVSKÝ, Jiří. Solutions to Puzzles of Existential Generalisation. In \textit{10th Non-Classical Logic. Theory and Application (NCL'22)}. 2022.
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