Translations:Faq/Math/001/7/cs
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[math]\displaystyle{ |x| = \left\{ \begin{array}{lr} -x & , x\lt 0 \\ x & , x \ge 0 \end{array} \right. }[/math] | abs x = left lbrace matrix { -x #, x <0 ## x # , x>= 0 } right none |