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When we collapse the boundary of a disk to a point, the resulting quotient space is homeomorphic to a sphere.
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When we collapse the boundary of a disk to a point, the resulting quotient space is homeomorphic to a sphere.
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Related words
quotient space
Noun
Japanese Meaning
ある同値関係に基づいて、元の空間の同値な点（同値類）を一つにまとめた新たな空間。特に位相空間や代数において、対象の集合や空間を同値関係により「縮約」することで得られる空間を指す。
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