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22/06/1910 German mathematician Felix Klein dies

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Klein Bottles - Numberphile

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klein bottle fluid simulation

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A mirror paradox, Klein bottles and Rubik's cubes

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Smale's inside out paradox

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Amazing Discovery With Glass - The Klein Bottle

To the general public he is most known as the inventor of the Klein bottle. It is a single sided object with no boundary. Its inside is its outside. It contains itself. The Klein bottle is similar to the Möbius Loop. A true Klein Bottle requires 4-dimensions because the surface has to pass through itself without a hole.