data/mathematical/285.mml
<math xmlns='http://www.w3.org/1998/Math/MathML' display='inline'><semantics><mrow><mo stretchy="false">|</mo><mi>A</mi><mo stretchy="false">|</mo><mo>=</mo><mrow><mo>∣</mo><mrow><mtable displaystyle="false" rowspacing="0.5ex" rowlines="none"><mtr><mtd><mi>a</mi></mtd> <mtd><mi>b</mi></mtd></mtr> <mtr><mtd><mi>c</mi></mtd> <mtd><mi>d</mi></mtd></mtr></mtable></mrow><mo>∣</mo></mrow><mo>=</mo><mi>a</mi><mi>d</mi><mo>−</mo><mi>b</mi><mi>c</mi></mrow><annotation encoding='application/x-tex'>|A| = \begin{vmatrix} a & b\\c & d \end{vmatrix}=ad - bc</annotation></semantics></math>