proposition: Lemma eq_mktuple T' (f1 f2 : 'I_n -> T') : f1 =1 f2 -> mktuple f1 = mktuple f2.
proof: Proof. by move=> eq_f; apply eq_from_tnth=> i; rewrite !tnth_map eq_f. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq choice fintype path)