fact: Definition pr12_GH {Y} {y:Y} {l:y = y} (u:GH l) := pr1 (pr2_GH l u) : Y.
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