proposition: Lemma bigmax_idr P F : \big[max/x]_(i <- r | P i) F i = max (\big[max/x]_(i <- r | P i) F i) x.
proof: Proof. by rewrite [LHS]bigmax_idl maxC. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)