vector with addition
<math xmlns="http://www.w3.org/1998/Math/MathML">
<apply>
<csymbol cd="linalg2">vector</csymbol>
<apply>
<csymbol cd="arith1">plus</csymbol>
<ci>x</ci>
<ci>y</ci>
</apply>
<cn>3</cn>
<cn>7</cn>
</apply>
</math>
Author: MathML 2 Recomendation