fact: Structure bigTheta_type {W} (F : set_system T) (g : T -> W) := BigTheta { bigTheta_fun :> T -> V; _ : `[< bigTheta_def F bigTheta_fun g >] }.
imports: HB(structures) mathcomp(all_ssreflect ssralg ssrnum) mathcomp(mathcomp_extra boolp classical_sets functions) ereal reals signed topology normedtype prodnormedzmodule