negative part(redirected from Positive and negative parts)
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negative part[′neg·əd·iv ′pärt]
For a real-valued function ƒ, this is the function, denoted ƒ-, for which ƒ-(x) = ƒ(x) if ƒ(x)≤0 and ƒ-(x) = 0 if ƒ(x)>0.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.