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significance, math term (?) by salix2005-03-10 01:53:19
  From Mathworld: by BloodyViking 2006-11-19 12:55:59
Significant Digits
When a number is expressed in scientific notation, the number of significant figures is the number of digits needed to express the number to within the uncertainty of measurement.

Significance Arithmetic
Significance arithmetic is the arithmetic of approximate numerical quantities that not only keeps track of numerical results, but also uses error propagation to track their accuracy.

Note that the links contain Significantly more information then what I copied. ;-)

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