Notazione matematica con LaTeX

• Sintassi: \left|...\right|

Es.: $$$\left|b-a\right|$$$ genera $$\left|b-a\right|$$

Es.: $$$\left|\begin{array}{cc}a&b\\c&d \end{array}\right|$$$ genera $$\left|\begin{array}{cc}a&b\\c&d \end{array}\right|$$