🌐EnglishEnglishBahasa IndonesiaDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsSvenskaTiếng ViệtTürkçeРусскийالعربيةفارسیहिन्दी한국어中文日本語EntityQ662830· pop 33· linked from 454 articlesfundamental groupmathematical group of the homotopy classes of loops in a topological spaceConnectionshomotopyEntityconnected spaceEntityCategoriesAlgebraic topologyHomotopy theory