<math display="block"> <mml:mrow> <mml:msup> <mml:mi>r</m:mi> <mml:mrow> <mml:mo stretchy='false'>(</m:mo><mml:mi>h</m:mi><mml:mo stretchy='false'>)</m:mo> </m:mrow> </m:msup> <mml:mo stretchy='false'>(</m:mo><mml:mi>u</m:mi><mml:mo>;</m:mo><mml:mi>&#x03C9;</m:mi><mml:mo stretchy='false'>)</m:mo> </m:mrow> </m:math>