proposition: Corollary is_epi_pre_whisker_left_adjoint_counit : isEpi εF.
proof: Proof. apply is_nat_trans_epi_from_pointwise_epis. apply is_epi_pre_whisker_left_adjoint_counit_pointwise. Qed.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Epis UniMath.CategoryTheory.Epis UniMath.CategoryTheory.SplitMonicsAndEpis UniMath.CategoryTheory.Monics UniMath.CategoryTheory.FunctorCategory UniMath.CategoryTheory.whiskering