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VOLUME 4, ISSUE 3, PAPER 13


On the strength of proof-irrelevant type theories

©Benjamin Werner, INRIA

Abstract
We present a type theory with some proof-irrelevance built into the conversion rule. We argue that this feature is useful when type theory is used as the logical formalism underlying a theorem prover. We also show a close relation with the subset types of the theory of PVS. We show that in these theories, because of the additional extentionality, the axiom of choice implies the decidability of equality, that is, almost classical logic. Finally we describe a simple set-theoretic semantics.

Publication date: September 26, 2008

Full Text: PDF | PostScript
DOI: 10.2168/LMCS-4(3:13)2008

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