The unique nonnegative square root of a nonnegative real number. For example, the principal square root of 9 is 3, although both
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The concept of principal square root cannot be extended to real negative numbers since the two square roots of a negative number cannot be distinguished until one of the two is defined as the imaginary unit, at which point
SEE ALSO: Cube Root, i, nth Root, Principal Root of Unity, Radical, Square Root, Surd
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