Brehm's Projective Plane
Removing a topological disk from one of these leaves an immersed
Möbius band with its boundary forming an "up-down-up-down-up-down" pattern.
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Removing a topological disk from one of these leaves an immersed
Möbius band with its boundary forming an "up-down-up-down-up-down" pattern.
|
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