proposition: Lemma sle_slt_trans ks t1 t2 t3 : t1 <=[ks] t2 -> t2 <[ks] t3 -> t1 <[ks] t3.
proof: Proof. by apply: leq_ltn_trans. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path interval order) pcm(options prelude ordtype seqext)