Marek14 wrote:http://en.wikipedia.org/wiki/Klein_Bottle is a good place to start
Klein bottle can only be realized in 3D by letting it intersect itself. In four dimensions, you can get rid of the intersection.
wendy wrote:A klein bottle is given to a way of connecting the edges of a square together.
quickfur wrote: a real projective plane when you twist both pairs. Are there any other possible topological combinations? Is it possible to use hexagons instead of squares, and have a triple twist?
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