fact: Definition the_bigTheta (u : unit) (F : filter_on T) (phF : phantom (set_system T) F) f g := bigTheta_fun (insubd (bigTheta_refl F g) f).
imports: HB(structures) mathcomp(all_ssreflect ssralg ssrnum) mathcomp(mathcomp_extra boolp classical_sets functions) ereal reals signed topology normedtype prodnormedzmodule