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op
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where u is the unit roundoff — roughly 10^{-16} for standard double precision — and op is addition, subtraction, multiplication, or division. Each single step, in other words, is correct up to a tiny, precisely bounded relative error.
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Equation 4 · Mathematics
This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.
where u is the unit roundoff — roughly 10^{-16} for standard double precision — and op is addition, subtraction, multiplication, or division. Each single step, in other words, is correct up to a tiny, precisely bounded relative error.
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