EntityQ862761· pop 27· linked from 316 articlesinteriorSign in to savegiven a subset S of a topological space X, the biggest set of points in S not part of the boundary of SConnectionsNicolas BourbakiEntitycomplementEntityJordan curve theoremEntitydiscrete spaceEntitymathematicsEntityInternational Standard Book NumberEntitycomplex numberEntityreal numberEntitytopologyEntityrational numberEntityempty setEntityOCLC, Inc.EntitysubsetEntitycontinuous functionEntityEuclidean spaceEntitymetric spaceEntityunionEntitytopological spaceEntitymanifoldEntitydistributive propertyEntityCategoriesClosure operatorsGeneral topology