EntityQ3183033· pop 6· linked from 20 articlesjoinSign in to savetopology termConnectionsdisjoint unionEntitymathematicsEntityInternational Standard Book NumberEntitycircleEntitytopologyEntitysphereEntitycubeEntitypolygonEntityconeEntitydigital object identifierEntitypyramidEntityline segmentEntitytetrahedronEntityEuclidean spaceEntitytopological spaceEntityequivalence relationEntityoctahedronEntityhomeomorphismEntitysimplexEntitypolytopeEntityCategoriesAlgebraic topologyOperations on structures