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 Exp

 http://functions.wolfram.com/01.03.21.0072.01

 Input Form

 Integrate[(1/z^2) E^(a z), z] == -(E^(a z)/z) + a ExpIntegralEi[a z]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["\[Integral]", RowBox[List[FractionBox["1", SuperscriptBox["z", "2"]], SuperscriptBox["\[ExponentialE]", RowBox[List["a", " ", "z"]]], RowBox[List["\[DifferentialD]", "z"]]]]]], "\[Equal]", RowBox[List[RowBox[List["-", FractionBox[SuperscriptBox["\[ExponentialE]", RowBox[List["a", " ", "z"]]], "z"]]], "+", RowBox[List["a", " ", RowBox[List["ExpIntegralEi", "[", RowBox[List["a", " ", "z"]], "]"]]]]]]]]]]

 MathML Form

 a z z 2 z a Ei ( a z ) - a z z z a z z 2 -1 a ExpIntegralEi a z -1 a z z -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["\[Integral]", RowBox[List[FractionBox[SuperscriptBox["\[ExponentialE]", RowBox[List["a_", " ", "z_"]]], SuperscriptBox["z_", "2"]], RowBox[List["\[DifferentialD]", "z_"]]]]]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List["-", FractionBox[SuperscriptBox["\[ExponentialE]", RowBox[List["a", " ", "z"]]], "z"]]], "+", RowBox[List["a", " ", RowBox[List["ExpIntegralEi", "[", RowBox[List["a", " ", "z"]], "]"]]]]]]]]]]

 Date Added to functions.wolfram.com (modification date)

 2002-12-18