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Apr 24, 2015 at 18:44 vote accept Mike Shulman
Apr 22, 2015 at 7:32 comment added Mike Shulman @abx The description of the strophoid in the Wikipedia article involves distance, which doesn't exist in a projective plane. Is there a version of it that doesn't use distances?
Apr 22, 2015 at 7:29 history edited Mike Shulman CC BY-SA 3.0
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Apr 22, 2015 at 7:09 history edited Francesco Polizzi
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Apr 22, 2015 at 6:43 answer added Francesco Polizzi timeline score: 10
Apr 22, 2015 at 6:17 comment added abx There are many such constructions for rational (singular) curves, e.g. the strophoid, see this Wikipedia article. My intuition is that such geometric constructions will always produce rational curves, though I don't know how to justify it.
Apr 22, 2015 at 5:15 history asked Mike Shulman CC BY-SA 3.0