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Typal Heterogeneous Equality Types
arXiv - CS - Logic in Computer Science Pub Date : 2019-07-17 , DOI: arxiv-1907.07501
Andrew M. Pitts

The usual homogeneous form of equality type in Martin-L\"of Type Theory contains identifications between elements of the same type. By contrast, the heterogeneous form of equality contains identifications between elements of possibly different types. This paper introduces a simple set of axioms for such types. The axioms are equivalent to the combination of systematic elimination rules for both forms of equality, albeit with typal (also known as "propositional") computation properties, together with Streicher's Axiom K, or equivalently, the principle of uniqueness of identity proofs.
更新日期:2020-01-14

 

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