𝔖 Bobbio Scriptorium
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NOTES ON TERRELL'S “BRENTANO'S LOGICAL INNOVATIONS”

✍ Scribed by Kurt Rudolf Fischer; Leon R. Miller


Book ID
111209724
Publisher
John Wiley and Sons
Year
1976
Tongue
English
Weight
229 KB
Volume
1
Category
Article
ISSN
0363-6550

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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