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How to write Latex symbol norm vector or value ?
How to write Latex symbol norm for frac?
How to write Latex symbol norm for sum?
\lVert and \rVert
\lVert x \rVert
$$\lVert \vec{x} \rVert$$
\lVert \cos x \rVert
$$\lVert \cos x \rVert$$
\left\lVert \frac{1}{x} \right\rVert
$$\left\lVert \frac{1}{x} \right\rVert$$
\left\lVert \sum_{k=1}^n \alpha_k\right\rVert
$$\left\lVert \sum_{k=1}^n \alpha_k\right\rVert$$