proposition: Lemma ord_sorted_eq (s1 s2 : seq T) : sorted ord s1 -> sorted ord s2 -> s1 =i s2 -> s1 = s2.
proof: Proof. by exact/irr_sorted_eq/irr/trans. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path fintype) pcm(options)