I guess actually all time zones become adjacent at the poles. (Excluding +13, +14, and fractional zones.) Whatever. That doesn't count.
@Sniffnoy What would you say it means for two disjoint sets in a metric space to be adjacent?
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@InstanceOfClass In a general metric space, in a way that disallows "touching at corners"? I don't know that such a notion makes sense. -
@Sniffnoy You could say X, Y are adjacent iff ∃z∈(X∪Y) such that every open set containing z intersects both X and Y. - 11 more replies
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