BUILT-IN MATHEMATICA SYMBOL
Sign
- Mathematical function, suitable for both symbolic and numerical manipulation.
- For non-zero complex numbers z, Sign[z] is defined as z/Abs[z].
- Sign tries various transformations in trying to determine the sign of symbolic expressions.
- For exact numeric quantities, Sign internally uses numerical approximations to establish its result. This process can be affected by the setting of the global variable $MaxExtraPrecision.
- Sign automatically threads over lists.
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, 
, or 
depending on whether x is negative, zero, or positive. 
