The letter o represents the ouroboros. The letter u represents the failed ouroboros, too small to wrap itself all the way around a world
my math jokes are usually on purpose, this time though I don't think I'm topology-savvy enough to shitpost about it competently
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there's a contrived application to physics that was lectured to me recently, whereby your field takes values on a 2-sphere, ...
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...and you assume that it tends to const. at infinity, so you say spacetime is a "3-sphere", and so classify fields by map degree
End of conversation
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