EntityQ1503309· pop 14· linked from 175 articlesgeometrization conjectureSign in to savetheorem that closed 3-manifolds uniquely decompose into pieces with 1 of 8 types of geometric structureConnectionsorientabilityEntityhomology sphereEntityPoincaré conjectureEntityRiemann surfaceEntityHaar measureEntitySeifert fiber spaceEntitygeometryEntityInternational Standard Book NumberEntitysphereEntitydigital object identifierEntityInternational Standard Serial NumberEntitytheoremEntityEuclidean geometryEntityFields medalEntityGrigori PerelmanEntitysurfaceEntitytorusEntitymetric spaceEntitybibcodeEntityQ118398EntityCategories3-manifoldsConjectures that have been provedGeometric topologyRiemannian geometryTheorems in topology