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Martin Sleziak
Martin Sleziak
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It's not possible to comb a hedgehog.

Or, alternatively:

You can't comb the hair on a coconut.

Both statements are referring to the fact that every continuous tangent vector field on the 2-sphere has to vanish at some point. That's the well known Hairy ball theoremHairy ball theorem.

It's not possible to comb a hedgehog.

Or, alternatively:

You can't comb the hair on a coconut.

Both statements are referring to the fact that every continuous tangent vector field on the 2-sphere has to vanish at some point. That's the well known Hairy ball theorem.

It's not possible to comb a hedgehog.

Or, alternatively:

You can't comb the hair on a coconut.

Both statements are referring to the fact that every continuous tangent vector field on the 2-sphere has to vanish at some point. That's the well known Hairy ball theorem.

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Armin Straub
Armin Straub
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It's not possible to comb a hedgehog.

Or, alternatively:

You can't comb the hair on a coconut.

Both statements are referring to the fact that every continuous tangent vector field on the 2-sphere has to vanish at some point. That's the well known Hairy ball theorem.