This is an example of grouping terms in an expression in MathML.
<!doctype html> <html> <head> <title>XoaX.net's MathML: A Grouping of Terms Example</title> </head> <body> <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> </body> </html>
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