Covering Spaces in Homotopy Type Theory
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Covering spaces play an important role in classical homotopy theory, whose algebraic characteristics have deep connections with fundamental groups of underlying spaces. It is natural to ask whether these connections can be stated in homotopy type theory (HoTT), an exciting new framework coming with an interpretation in homotopy theory. This note summarizes the author’s attempt to recover the classical results (e.g., the classification theorem) so as to explore the expressiveness of the new foundation. Some interesting techniques employed in the current proofs seem applicable to other constructions as well.
KeywordsHomotopy Type Theory (HoTT) Algebraic Characteristics Current Proof Higher Inductive Types Agda Proof Assistant
I want to thank Carlo Angiuli, Steve Awodey, Spencer Breiner, Guillaume Brunerie, Daniel Grayson, Robert Harper, Chris Kapulkin, and Ed Morehouse for helping me learn the classical theory, improve the presentation, and revise previous versions. This material is based upon work supported by the National Science Foundation under Grant No. 1116703.
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