absolute value

absolute value, magnitude of a number or other mathematical expression disregarding its sign; thus, the absolute value is positive, whether the original expression is positive or negative. In symbols, if |a| denotes the absolute value of a number a, then |a| = a for a > 0 and |a| = −a for a < 0. For example, |7|= 7 since 7 > 0 and |−7| = −(−7), or |−7| = 7, since −7 < 0.

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absolute value

Measure of the magnitude of a real number, complex number, or vector. Geometrically, the absolute value represents (absolute) displacement from the origin (or zero) and is therefore always nonnegative. If a real number a is positive or zero, its absolute value is itself; if a is negative, its absolute value is −a. A complex number z is typically represented by an ordered pair (a, b) in the complex plane. Thus, the absolute value (or modulus) of z is defined as the real number √a² + b², which corresponds to z’s distance from the origin of the complex plane. Vectors, like arrows, have both magnitude and direction, and their algebraic representation follows from placing their “tail” at the origin of a multidimensional space and extracting the corresponding coordinates, or components, of their “point.” The absolute value (magnitude) of a vector is then given by the square root of the sum of the squares of its components. For example, a three-dimensional vector v, given by (a, b, c), has absolute value √a² + b² + c². Absolute value is symbolized by vertical bars, as in |x|, |z|, or |v|, and obeys certain fundamental properties, such as |a ∙ b| = |a| ∙ |b| and |a + b| ≤ |a| + |b|.

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absolute value [′ab·sə‚lüt ′val·yü]

Also known as magnitude.

(mathematics)

For a real number, the number if it is nonnegative, and the negative of the number if it is negative. Also known as numerical value.

For a complex number, the square root of the sum of the squares of its real and imaginary parts. Also known as modulus.

The length of a vector, disregarding its direction; the square root of the sum of the squares of its orthogonal components.