fact: Definition K_0 (M:ExactCategory) : abgr := presented_abgr (π₀ (ob M)) (K_0_hrel M).
imports: UniMath.Tactics.EnsureStructuredProofs UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.ExactCategories.ExactCategories UniMath.Algebra.Groups UniMath.Algebra.Free_Monoids_and_Groups