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Wittgenstein's Notes on Logic – By Michael Potter

✍ Scribed by Pasquale Frascolla


Book ID
111367689
Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
67 KB
Volume
64
Category
Article
ISSN
0012-2017

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A note on Grzegorczyk's logic
✍ Emil Jeřábek 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 71 KB

## 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