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NDJFL
2002
75views more  NDJFL 2002»
11 years 1 months ago
Definability of Initial Segments
In any nonstandard model of Peano arithmetic, the standard part is not first order definable. But we show that in some model the standard part is definable as the unique solution ...
Saharon Shelah, Akito Tsuboi
NDJFL
2002
74views more  NDJFL 2002»
11 years 1 months ago
The Semantics of Entailment Omega
This paper discusses the relation between the minimal positive relevant logic B+ and intersection and union type theories. There is a marvellous coincidence between these very diff...
Mariangiola Dezani-Ciancaglini, Robert K. Meyer, Y...
NDJFL
2002
83views more  NDJFL 2002»
11 years 1 months ago
Shortest Axiomatizations of Implicational S4 and S5
Shortest possible axiomatizations for the implicational fragments of the modal logics S4 and S5 are reported. Among these axiomatizations is included a shortest single axiom for im...
Zachary Ernst, Branden Fitelson, Kenneth Harris, L...
NDJFL
2002
60views more  NDJFL 2002»
11 years 1 months ago
The Complexity of Revision, Revised
Gian Aldo Antonelli
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