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The radical symbol refers to the principal value of the square root function called the principal square root, which is the positive one. The two square roots of a negative number are both imaginary numbers , and the square root symbol refers to the principal square root, the one with a positive imaginary part.
The square root of a positive integer is the product of the roots of its prime factors, because the square root of a product is the product of the square roots of the factors. Since p 2 k = p k , {\textstyle {\sqrt {p^{2k}}}=p^{k},} only roots of those primes having an odd power in the factorization are necessary.
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Square sign may refer to: The number sign # The radical symbol or √ used for square root, or its precomposed form with a number, such as the Unicode characters for the cube root and the fourth root, ∛ and ∜; Any square-shaped symbol, including many geometrically shaped Unicode characters
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Square root of two as the hypotenuse of a right isosceles triangle of side 1. SVG redraw of original work. Date: 4 July 2008, 19:44 (UTC) Source: Square root of 2 triangle.png: Author: derivative work: Pbroks13 ; Square root of 2 triangle.png: en:User:Fredrik; Simplified drawing: Rubber Duck (☮ • ) SVG development
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