fact: Definition compact_open_def := sup_topology (fun i : sigT (@compact T) => Topological.class (@compact_openK (projT1 i))).
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap generic_quotient) mathcomp(boolp classical_sets functions) mathcomp(cardinality mathcomp_extra fsbigop) reals signed