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On Tue, 2016-08-16 at 19:33 +0000, Bill Long wrote: > The math types might cringe at including -pi (or at the concept of > -0.0). As Velvel Kahan (Ph.D., Math, U. Toronto) (and Jerry Coonen) pointed out, -0.0 isn't zero, it's underflowed from a negative nonzero. For some problems, it's an important distinction.