Archive for Mathematical Logic 38 (8):521-547 (1999)

Sara Negri
University of Helsinki
Contraction-free sequent calculi for intuitionistic theories of apartness and order are given and cut-elimination for the calculi proved. Among the consequences of the result is the disjunction property for these theories. Through methods of proof analysis and permutation of rules, we establish conservativity of the theory of apartness over the theory of equality defined as the negation of apartness, for sequents in which all atomic formulas appear negated. The proof extends to conservativity results for the theories of constructive order over the usual theories of order.
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DOI 10.1007/s001530050137
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Proof Theory for Modal Logic.Sara Negri - 2011 - Philosophy Compass 6 (8):523-538.
Constructive Completions of Ordered Sets, Groups and Fields.Erik Palmgren - 2005 - Annals of Pure and Applied Logic 135 (1-3):243-262.
The Eskolemization of Universal Quantifiers.Rosalie Iemhoff - 2010 - Annals of Pure and Applied Logic 162 (3):201-212.
For Oiva Ketonen's 85th Birthday.Sara Negri & Jan von Plato - 1998 - Bulletin of Symbolic Logic 4 (4).

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