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The circle embedded in the plane is a classic example of a deformation retract of the punctured plane.
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The circle embedded in the plane is a classic example of a deformation retract of the punctured plane.
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Related words
deformation retract
Noun
Japanese Meaning
位相空間において、全体空間から部分空間へと収縮（リアクション）が存在し、その収縮が全体空間の恒等写像から連続的変形によって得られるような部分空間。
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