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Proof Theories for Semilattice Logics

✍ Scribed by Steve Giambrone; Alasdaire Urquhart


Publisher
John Wiley and Sons
Year
1987
Tongue
English
Weight
400 KB
Volume
33
Category
Article
ISSN
0044-3050

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## Abstract In this paper we study the modal behavior of Σ‐preservativity, an extension of provability which is equivalent to interpretability for classical superarithmetical theories. We explain the connection between the principles of this logic and some well‐known properties of HA, like the disj