proposition: Lemma equivORL F (f g : T -> V) : f ~_F g -> g =O_F f.
proof: Proof. by move/equiv_sym/equivOLR. Qed.
imports: HB(structures) mathcomp(all_ssreflect ssralg ssrnum) mathcomp(mathcomp_extra boolp classical_sets functions) ereal reals signed topology normedtype prodnormedzmodule