fact: Definition pr1_GH {Y} {y:Y} {l:y = y} := pr1 : GH l -> Torsor ℤ.
imports: UniMath.Foundations.All UniMath.MoreFoundations.PartA UniMath.Algebra.Monoids UniMath.Algebra.Groups UniMath.NumberSystems.Integers UniMath.SyntheticHomotopyTheory.AffineLine UniMath.Algebra.GroupAction UniMath.MoreFoundations.MoreEquivalences