✦ LIBER ✦

A Note on Logic and Existence

✍ Scribed by Arthur Pap

Book ID: 124778763
Publisher: Oxford University Press
Year: 1947
Tongue: English
Weight: 170 KB
Volume: 56
Category: Article
ISSN: 0026-4423
DOI: 10.2307/2250677

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## Abstract Grzegorczyk's modal logic (Grz) corresponds to the class of upwards well‐founded partially ordered Kripke frames, however all known proofs of this fact utilize some form of the Axiom of Choice; G. Boolos asked in [1], whether it is provable in plain ZF. We answer his question negatively

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