proposition: Lemma rev_inj (T: Type) : injective (@rev T).
proof: Proof. by apply: inv_inj; apply: revK. Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat) mathcomp(seq path fintype div bigop binomial) mathcomp(prime finset ssralg ssrnum ssrint)