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Signum

From Encyclopedia of Mathematics
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The function of a real variable which is equal to 1 if is positive, equal to 0 if is zero and equal to if is negative. Notation: or . Thus,


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The signum function is usually extended to the complex plane by if (and ). Thus, it measures the angle of the ray from the origin on which lies.

How to Cite This Entry:
Signum. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Signum&oldid=14138
This article was adapted from an original article by Yu.A. Gor'kov (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article