This is an example of grouping terms in an expression in MathML.
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<title>XoaX.net's MathML: A Grouping of Terms Example</title>
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<p>The first two terms represent a dot product of vectors:
<math>
<munder accentunder="true">
<mrow>
<mi>a</mi>
<mi>x</mi>
<mo>+</mo>
<mi>b</mi>
<mi>y</mi>
</mrow>
<mo>⏟</mo>
</munder>
<mo>+</mo>
<mi>c</mi>
<mo>=</mo>
<mn>0</mn>
</math>
</p>
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