Lemma assoc_fun_to_seq : isAssociative_fun → isAssociative_seq. Proof. intros assoc x. exact (assoc _ _ (λ i j, x i j)). Defined.
Require Import UniMath.MoreFoundations.Tactics. Require Import UniMath.Algebra.Groups. Require Import UniMath.MoreFoundations.NegativePropositions.