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Crescents. The definition of a crescent is: two lines the connect at end points, and crescents don't nessicarly mean they have to be shaped like the crescent moon. If drawn correctly, they can be semetrical.

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14y ago

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The proper mathematical object is the complex projective space CP1 quotiented out by the group action of Z mod 2 i.e. (CP^1)/(Zmod2)=CP^1/(+-1)

Taking the Riemann Sphere, we identify antipodal points.

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12y ago
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prolate spheroid

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14y ago
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It is a prolate spheroid.

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13y ago
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Everything, the world is 3D.

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12y ago
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a square

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12y ago
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duck

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15y ago
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