Normalisation by Evaluation for Type Theory, in Type Theory

Autor: Thorsten Altenkirch, Ambrus Kaposi
Jazyk: angličtina
Rok vydání: 2017
Předmět:
Zdroj: Logical Methods in Computer Science, Vol Volume 13, Issue 4 (2017)
Druh dokumentu: article
ISSN: 1860-5974
DOI: 10.23638/LMCS-13(4:1)2017
Popis: We develop normalisation by evaluation (NBE) for dependent types based on presheaf categories. Our construction is formulated in the metalanguage of type theory using quotient inductive types. We use a typed presentation hence there are no preterms or realizers in our construction, and every construction respects the conversion relation. NBE for simple types uses a logical relation between the syntax and the presheaf interpretation. In our construction, we merge the presheaf interpretation and the logical relation into a proof-relevant logical predicate. We prove normalisation, completeness, stability and decidability of definitional equality. Most of the constructions were formalized in Agda.
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