proposition: Lemma bigcup_ointsub_sub U q : bigcup_ointsub U q `<=` U.
proof: Proof. by move=> y [A [[oA _ +] _ Ay]]; exact. Qed.
imports: HB(structures) mathcomp(all_ssreflect ssralg ssrint ssrnum finmap matrix) mathcomp(rat interval zmodp vector fieldext falgebra) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(cardinality set_interval Rstruct) ereal reals signed topology prodnormedzmodule