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Abs
 Abs[z] gives the absolute value of the real or complex number z.
For complex numbers  , Abs[z] gives the modulus  .
Abs[z] is left unevaluated if z is not a numeric quantity.
See The Mathematica Book: Section 1.1.3, Section 1.1.5, Section 3.2.2 and Section 3.2.2.
See also: Re, Im, Arg, Mod, ComplexExpand.
Further Examples
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