Complete infinitary type logics

Studia Logica 63 (1):85-119 (1999)
Abstract
For each regular cardinal κ, we set up three systems of infinitary type logic, in which the length of the types and the length of the typed syntactical constructs are $\Sigma _{}$ , the global system $\text{g}\Sigma _{}$ and the τ-system $\tau \Sigma _{}$ . A full cut elimination theorem is proved for the local systems, and about the τ-systems we prove that they admit cut-free proofs for sequents in the τ-free language common to the local and global systems. These two results follow from semantic completeness proofs. Thus every sequent provable in a global system has a cut-free proof in the corresponding τ-systems. It is, however, an open question whether the global systems in themselves admit cut elimination
Keywords Philosophy   Logic   Mathematical Logic and Foundations   Computational Linguistics
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