proposition: Fact tnth_compl t i : tnth (compl t) i = ~` tnth t i.
proof: Proof. by rewrite tnth_map. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat choice seq) mathcomp(path fintype tuple bigop finset div prime finfun) mathcomp(finset)