Hairy Ball Theorem Sign Video
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Definition
There does not exist an everywhere nonzero tangent vector field on the 2-sphere S^2. This implies that somewhere on the surface of the Earth, there is a point with zero horizontal wind velocity. The theorem can be generalized to the statement that the n-sphere S^n has a nonzero tangent vector field if and only if n is odd.
Source: http://mathworld.wolfram.com
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