rec-min2

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <apply>
    <csymbol cd="minmax1">min</csymbol>
    <apply>
      <csymbol cd="set1">map</csymbol>
      <bind>
        <csymbol cd="fns1">lambda</csymbol>
        <bvar>
          <ci>x</ci>
        </bvar>
        <apply>
          <csymbol cd="arith1">power</csymbol>
          <ci>x</ci>
          <cn>2</cn>
        </apply>
      </bind>
      <apply>
        <csymbol cd="set1">suchthat</csymbol>
        <ci>R</ci>
        <bind>
          <csymbol cd="fns1">lambda</csymbol>
          <bvar>
            <ci>x</ci>
          </bvar>
          <apply>
            <csymbol cd="set1">notin</csymbol>
            <ci>x</ci>
            <semantics>
              <ci>B</ci>
              <annotation-xml cd="mathmltypes" name="type" encoding="MathML-Content">
                <ci>set</ci>
              </annotation-xml>
            </semantics>
          </apply>
        </bind>
      </apply>
    </apply>
  </apply>
</math>

Author: MathML 2 Recommendation