Turning a sphere inside-out *****
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This possibility was discovered by Smale in 1958 ( wiki EN ) by observing homotopy groups.
An unbelievable animation (with intersections of course) is e.g. here ( YouTube EN ).
This possibility was discovered by Smale in 1958 ( wiki EN ) by observing homotopy groups.
An unbelievable animation (with intersections of course) is e.g. here ( YouTube EN ).