fact: Definition symmetric_whiskers_swap_nat_z_iso {C : category} {M : monoidal C} (B : symmetric M) (x : C) : nat_z_iso _ _ := symmetric_whiskers_swap_nat_trans B x,, symmetric_whiskers_swap_is_nat_iso B x.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Monoidal.WhiskeredBifunctors UniMath.CategoryTheory.Monoidal.Categories