<math display="block">
<mml:mrow>
<mml:mi>C</m:mi><mml:mo>=</m:mo><mml:mi>f</m:mi><mml:mo stretchy='false'>(</m:mo><mml:mi>w</m:mi><mml:mo>,</m:mo><mml:mo> </m:mo><mml:mi>y</m:mi><mml:mo>,</m:mo><mml:mo> </m:mo><mml:mi>z</m:mi><mml:mo stretchy='false'>)</m:mo>
</m:mrow>
</m:math>