Definition isCommutative_fun := ∏ n (x:⟦n⟧ → X) (f:⟦n⟧≃⟦n⟧), iterop_fun (x ∘ f) = iterop_fun x.
Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.Algebra.Groups. Require Import UniMath.MoreFoundations.NegativePropositions.