Formalization of the zigzag construction of path spaces of pushouts in homotopy type theory
Abstract
A pre-print of Wärn gives a pen-and-paper construction of a type family characterizing the path spaces of an arbitrary pushout, and a natural language argument for its correctness. This paper presents the first formalization of the construction and a proof that it is fiberwise equivalent to the path spaces. The formalization is carried out in axiomatic homotopy type theory, using the Agda proof assistant and the agda-unimath library.
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