Type theory in type theory using quotient inductive types
Type theory in type theory using quotient inductive types
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DOI:
10.1145/2837614.2837638
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发表时间:
2016-01
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通讯作者:
Thorsten Altenkirch;A. Kaposi
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文献类型:
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作者:
Thorsten Altenkirch;A. Kaposi
We present an internal formalisation of a type heory with dependent types in Type Theory using a special case of higher inductive types from Homotopy Type Theory which we call quotient inductive types (QITs). Our formalisation of type theory avoids referring to preterms or a typability relation but defines directly well typed objects by an inductive definition. We use the elimination principle to define the set-theoretic and logical predicate interpretation. The work has been formalized using the Agda system extended with QITs using postulates.