<math>
<apply>
<max/>
<bvar><ci>x</ci></bvar>
<condition>
<apply><and/>
<apply><in/><ci>x</ci><ci type="set">B</ci></apply>
<apply><notin/><ci>x</ci><ci type="set">C</ci></apply>
</apply>
</condition>
<ci>x</ci>
</apply>
</math>