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| elementary special functions | |
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''For the Trance dance act called Signum, see Signum (Music Group) . In Mathematics and especially in Computer Science , the sign function is a logical Function which extracts the sign of a Real Number . To avoid confusion with the Sine function, this function is often called the '''signum function'''. The sign function is often represented as '''sgn''' and can be defined thus: : or using the Iverson Bracket notation: : Any real number can be expressed as the product of its Absolute Value and its sign function: |
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