A closed curve on a sphere with a point not on the curve can be
contracted to a point without crossing the point not the curve no matter
where that point is.
Brent
On 1/24/2020 5:38 PM, Alan Grayson wrote:
Both are connected. Both have no boundary. Both are closed, since both
contain their accumulation points. Both have uncountable elements. So
how can they be distinguished within the context of point-set
topology? TIA, AG
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