[Cfp-interest 1520] Background on hypot(x, y) for INFINITY and NAN

[Damian McGuckin]

This is more an IEEE 754 issue.

I know it is long ago but does anybody have any reference document to the
reasons behind the special values for hypot(x, y). I understand the logic
in the context of statistics where NaNs might represent missing values but 
I was after more background.

Thanks - Damian

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