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The Hurewicz theorem in homotopy type theory

J Daniel Christensen and Luis Scoccola

Algebraic & Geometric Topology 23 (2023) 2107–2140
Abstract

We prove the Hurewicz theorem in homotopy type theory, ie that for X a pointed, (n1)–connected type, with n 1, and A an abelian group, there is a natural isomorphism πn(X)ab AH~n(X;A) relating the abelianization of the homotopy groups with the homology. We also compute the connectivity of a smash product of types and express the lowest nontrivial homotopy group as a tensor product. Along the way, we study magmas, loop spaces, connected covers and prespectra, and we use 1–coherent categories to express naturality and for the Yoneda lemma.

As homotopy type theory has models in all –toposes, our results can be viewed as extending known results about spaces to all other –toposes.

Keywords
Hurewicz theorem, homotopy group, homology group, magma, loop space, tensor product, homotopy type theory
Mathematical Subject Classification
Primary: 55Q99
Secondary: 03B38, 18N60, 55N99
References
Publication
Received: 29 September 2020
Revised: 24 January 2022
Accepted: 16 February 2022
Published: 25 July 2023
Authors
J Daniel Christensen
Department of Mathematics
University of Western Ontario
London, ON
Canada
Luis Scoccola
Department of Mathematics
University of Western Ontario
London, ON
Canada

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