作为应用给出同伦类型论的关系参数性证明;推论表明 loop space 上多态自函数的每个闭项同伦于某环路迭代拼接。
原文摘要(Abstract)
We introduce fibred type-theoretic fibration categories which are fibred categories between categorical models of Martin-Löf type theory. Fibred type-theoretic fibration categories give a categorical description of logical predicates for identity types. As an application, we show a relational parametricity result for homotopy type theory. As a corollary, it follows that every closed term of type of polymorphic endofunctions on a loop space is homotopic to some iterated concatenation of a loop.