AccuracyGoal
 Usage
• AccuracyGoal is an option for various numerical operations which specifies how many effective digits of accuracy should be sought in the final result.
Notes
• AccuracyGoal -> Automatic normally yields an accuracy goal equal to half the setting for WorkingPrecision. • AccuracyGoal -> Infinity specifies that accuracy should not be used as the criterion for terminating the numerical procedure. PrecisionGoal is typically used in this case. • Even though you may specify AccuracyGoal->n, the results you get may sometimes have much less than n-digit accuracy. • In most cases, you must set WorkingPrecision to be at least as large as AccuracyGoal. • AccuracyGoal effectively specifies the absolute error allowed in a numerical procedure. • With AccuracyGoal->a and PrecisionGoal->p, Mathematica attempts to make the numerical error in a result of size  be less than  . • New in Version 1; modified in 5.
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