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What is the norm of the vector $\mathbf{v}=(2,-1,3,-5)$ in $R^{4}$?
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The norm of the vector $\mathbf{v}=(2,-1,3,-5)$ in $R^{4}$ is: $$\|\mathbf{v}\|=\sqrt{2^{2}+(-1)^{2}+3^{2}+(-5)^{2}}=\sqrt{39}$$
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