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11 votes
2 answers
2k views

Why/does 'low-dimension' topology end with dimension 4? [duplicate]

Put another way, assuming it is somewhat fair to say that we (not I, but those who know better--part of my question is whether my stated assumption is in fact warranted) have in some sense a ...
14 votes
4 answers
6k views

Topology of black holes

I've asked this question of some physicist friends of mine and I've never gotten a satisfactory answer: What is topologically possible for a neighborhood of a black hole? To clarify, I'm curious about ...