@themattsimpson Think of ball floating over plane. Stereographic proj. wraps plane around ball, hitting every point except the north pole.
@themattsimpson "one-point compactification of the plane" is a fancy way of talking about stereographic projection https://en.wikipedia.org/wiki/Stereographic_projection …
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@themattsimpson The north pole can be thought of as the 'point at infinity' needed to seal it up.
End of conversation
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. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.