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A comment on Arithmetic is Hard--To Get Right: Wolfram Research on Excel bug.

Re:Arithmetic is Hard--To Get Right: Wolfram Research on Exc... by mhartl on Wednesday September 26, 2007 @11:16AM (#59828)
This reminds me of a bug in Mathematica from back in the late '90: there was a whole class of sums that Mathematica said were negative, even though each term in the sum was strictly positive! "Carry problem", my ass.
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