federico ardila
associate professor . san francisco state university
profesor adjunto . universidad de los andes . colombia

Born in 1993,

published by the name of "F. Ardila, A generalization of Euler's R>=2r, Crux Math. 21 (1995) p.1-2",

this note is not available electronically elsewhere and it contains some hard-to-find references.
(I have never even seen one of them; back then I just cited something that someone cited somewhere.)

So I retyped it and made it self-contained a couple of years later.
That is what this is.

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