🌐EnglishEnglishBahasa IndonesiaDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsSvenskaTiếng ViệtTürkçeРусскийالعربيةفارسی한국어中文日本語EntityQ2478475· pop 42· linked from 390 articlesneighborhoodset in a topological space that contains an open superset of a given point or subsetArticleA setVRead full article (417 paragraphs)Connectionsuniform spaceEntitymathematicsEntityCategoriesGeneral topologyMathematical analysisUse Oxford spelling from August 2016