Sign function
Mathematical function returning -1, 0 or 1 / From Wikipedia, the free encyclopedia
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"Sgn" redirects here. For other uses, see SGN (disambiguation).
Not to be confused with Sign relation or Sine function.
In mathematics, the sign function or signum function (from signum, Latin for "sign") is a function that returns the sign of a real number. In mathematical notation the sign function is often represented as .[1]