I'm aware that the complex projective line is a sphere, the Riemann sphere, and the dual projective line is a cylinder; but I can't find anything mentioning what shape the split-complex projective line would be. I probably could figure it out for myself, of course, but I'm surprised that it doesn't come up in searching.
2026-03-25 14:19:22.1774448362
What shape is the split-complex projective line?
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