The size of a number, in the sense of its distance from zero. The modulus or absolute value of a real number x (symbol |x|) is the difference between x and zero, regardless of sign. Thus if x > 0, |x| = x and if x < 0, |x| = -x. The modulus of a complex number, x = a + ib, is defined as 0198607679.modulus.1.jpg

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