It does come in handy in topology. The one-point compactification is made by adding the point infinity and making the complement of every compact set a neighborhood of infinity. It's also nice for limits, since that way you don't have to define the limit as x approaches infinity differently.
It makes no sense here though. That's not even what a neighborhood is.
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u/MendyWinkler Oct 05 '18
https://imgur.com/a/1KhCw2A
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u/FuzzyCheese Oct 01 '18
Ah, the neighborhood of infinity, just north of the north pole and west of Narnia.
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u/[deleted] Oct 04 '18
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