Talk:Soddy's hexlet
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[edit] Did Dupin know this?
Because of the close relation with the cyclides, it seems plausible that Dupin (or others in the influential French geometry school, such as Darboux) was aware of a similar result in the 19th century, but I don't have a reference. Geometry guy 12:00, 2 March 2007 (UTC)
I've indicated the result which I am almost sure Dupin knew. In fact, this property characterizes Dupin cyclides, but I think this is much later result. I'll dig up the later refs if anyone is interested (seems unlikely for now :) ) Geometry guy 21:55, 20 March 2007 (UTC)