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Mar 9, 2016 at 6:52 comment added Manfred Weis @FrancescoPolizzi thanks for supplying the name of those curves and for the pointer to MSE; that is already of help for me.
Mar 9, 2016 at 6:47 comment added Francesco Polizzi Probably you are looking for 3-ellipses. More generally, one can define k-ellipses, see this MSE question: math.stackexchange.com/questions/124333/…
Mar 9, 2016 at 6:39 history asked Manfred Weis CC BY-SA 3.0