This is an example of an absolute value in MathML.
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<title>XoaX.net's MathML: An Absolute Value Example</title>
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<p>
This is an example with an absolute value
<math display='block'>
<mrow>
<mtext>|</mtext>
<mi>x</mi>
<mtext>|</mtext>
</mrow>
<mo>=</mo>
<mi>x</mi>
<mtext> ⇔ </mtext>
<mrow>
<mi>x</mi>
<mo>≥</mo>
<mn>0</mn>
</mrow>
</math>
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