@themattsimpson @sarahdoingthing A category contains all the objects of a particular kind and all the functions between them.
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@sarahdoingthing ...if they're the 'same knot', topologically. This is super hard! But there are things called knot invariants. -
@sarahdoingthing A knot invariant is a recipe for turning a horribly complicated object (a tangled ball of string) into a simple one... -
@St_Rev (actually familiar from knitting tragedies)
End of conversation
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. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.