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>> No.15412951 [View]
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15412951

Consider the spaces X and Y (see pic). Both of them can be thought of as the closed unit disk D from which an open disk was removed: In X's case, we remove an open disk whose boundary is tangent to the boundary of D at a single point; in Y's case, we remove an open disk from the interior of D and obtain a closed annulus.

Are these spaces homeomorphic?

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