@themattsimpson Something like that. Really it's just the projective plane RP2. Wiki article seems much better for that.
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Replying to @St_Rev
@themattsimpson I was somewhat inaccurate in my rant. RP2 is one way to represent the crosscap closure of the disk.
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Replying to @St_Rev
@themattsimpson There are other ways the crosscap comes up, and of course it's work showing they're the same thing. Buuuuut
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@themattsimpson ...the wiki article doesn't have a lucid discussion of ANY representation, nor of what you'd use it for. It's just woof.
11:38 PM - 2 Apr 2015
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. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.