galotta
@galotta"It is not death that a man should fear, but he should fear never beginning to live." - Marcus Aurelius
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RE: Curious Mathematics: Hedgehogs, why cyclones exist and why 3-dimensional humans can't have nice hair
Well you could argue that it is just a corollary of the Poincaré-Hopf theorem, but I would not consider that the easiest proof. Correspondingly there are several approaches but you don't absolutely have