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Writing LaTeX  for multiple output formats : AMS mathematics symbols : Vertical bars

4.12 Vertical bars

$$
\left\lvert \frac{1}{2}\right\rvert \left\lVert \frac{1}{2}\right\rVert
$$
\[ \left\lvert \frac{1}{2}\right\rvert \left\lVert \frac{1}{2}\right\rVert \]
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