EntityQ320357· pop 32· linked from 495 articlesclosed setSign in to saveset whose complement is an open setConnectionscontinuous functionEntityHausdorff spaceEntityconnected spaceEntitydifferentiable manifoldEntitysubspace topologyEntityclopen setEntityuniform spaceEntitydomainEntitymathematicsEntitygeometryEntityInternational Standard Book NumberEntityintegerEntityreal numberEntitytopologyEntityrational numberEntitysetEntitylineEntitysequenceEntityempty setEntityOCLC, Inc.EntityCategoriesGeneral topology