Talk:Ptolemy's Inequality

The external link should be removed as the proof is written into the article. Thanks.--MCrawford 13:26, 21 June 2006 (EDT)

I just rewrote (wrote?) this article. However, I'm not crazy about the proof, because it involves a kind of unnatural construction, it's assymetric, and it doesn't work out that nicely with directed distances. Of course, it's much better than a complex numbers proof or something, though. I have a vague recollection that we covered a nicer proof (in addition to this one) at MOP this summer, but my notes have not yet revealed any intelligible outline of it, and a cursory Google search didn't reveal anything better than what I wrote here. Anyhow, if I come up with it, I'll add it in, but it may unfortunately just be a fantasy generated by my foggy memory. —Boy Soprano II 12:28, 24 November 2006 (EST)

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