z^(-a) == 1/z^a
Cell[BoxData[RowBox[List[SuperscriptBox["z", RowBox[List["-", "a"]]], "\[Equal]", FractionBox["1", SuperscriptBox["z", "a"]]]]]]
<math xmlns='http://www.w3.org/1998/Math/MathML' mathematica:form='TraditionalForm' xmlns:mathematica='http://www.wolfram.com/XML/'> <semantics> <mrow> <msup> <mi> z </mi> <mrow> <mo> - </mo> <mi> a </mi> </mrow> </msup> <mo> ⩵ </mo> <mfrac> <mn> 1 </mn> <msup> <mi> z </mi> <mi> a </mi> </msup> </mfrac> </mrow> <annotation-xml encoding='MathML-Content'> <apply> <eq /> <apply> <power /> <ci> z </ci> <apply> <times /> <cn type='integer'> -1 </cn> <ci> a </ci> </apply> </apply> <apply> <times /> <cn type='integer'> 1 </cn> <apply> <power /> <apply> <power /> <ci> z </ci> <ci> a </ci> </apply> <cn type='integer'> -1 </cn> </apply> </apply> </apply> </annotation-xml> </semantics> </math>
Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", SuperscriptBox["z_", RowBox[List["-", "a_"]]], "]"]], "\[RuleDelayed]", FractionBox["1", SuperscriptBox["z", "a"]]]]]]
2007-05-02