proposition: Lemma opred1 (S : tLatticeClosed T) : \top \in S.
proof: Proof. exact: opred1. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)