What is the definition of an edge?
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This is a 4D object so looks misleading in our 3D brainlet eyes. But an edge isn't really defined. "No edges" just means it has one side.
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looks like a 4D objected projected into 3D.pic.twitter.com/Hv13y4qUP1
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figit spinner?
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Surreal nose & ears.
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More accurately, this is an immersion of the projective plane into R^3.
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There is a really cool large model of it at MFO in Oberwolfach https://www.mfo.de/about-the-institute/history/Boy-Surface/boy_large.jpg …
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