chapter HoTT session HoTT = Pure + description {* Homotopy type theory based on intensional Martin-Löf type theory, with a cumulative universe hierarchy à la Russell. Follows the development of the theory in The Univalent Foundations Program, Homotopy Type Theory: Univalent Foundations of Mathematics, Institute for Advanced Study, (2013). Available online at https://homotopytypetheory.org/book. Author: Joshua Chen, University of Bonn (2018) *} sessions "HOL-Eisbach" theories HoTT (global) HoTT_Base HoTT_Methods "tests/Test" "ex/Methods" "ex/Synthesis" "ex/Book/Ch1"