For any positive integer,$n,$ we define $\mathbb{R}^n$ as the set of all n-tuples of real numbers.
Let $\mathbf{v}\in\mathbb{R}^n,$ then
$||\mathbf{v}|| = \sqrt{v_1^2 + v_2^2 + \cdot\cdot\cdot + v_n^2}$
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