基于参数性的半单纯与半立方集合的形式化
A parametricity-based formalization of semi-simplicial and semi-cubical sets
AI总结:
本文利用迭代Reynolds参数性与半单纯/半立方集的对应关系,提出统一的索引化定义,并在Coq中完成形式化。
摘要:
半单纯集和半立方集通常分别被定义为半单纯范畴或半立方范畴上的预层。同伦类型论随后推广了一种替代定义,其中n-单纯形或n-立方体的集合被重新分组为其面之上的纤维族,从而得到我们称之为索引化的刻画。此外,已知半单纯集和半立方集分别与其一元和二元变体中的迭代Reynolds参数性相关。我们利用这一对应关系,为增广半单纯集和半立方集开发了一种原创的统一索引化定义,并在Coq中对其进行了完整形式化。
英文摘要:
Semi-simplicial and semi-cubical sets are commonly defined as presheaves over respectively, the semi-simplex or semi-cube category. Homotopy Type Theory then popularized an alternative definition, where the set of n-simplices or n-cubes are instead regrouped into the families of the fibers over their faces, leading to a characterization we call indexed. Moreover, it is known that semi-simplicial and semi-cubical sets are related to iterated Reynolds parametricity, respectively in its unary and binary variants. We exploit this correspondence to develop an original uniform indexed definition of both augmented semi-simplicial and semi-cubical sets, and fully formalize it in Coq.
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