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 LaguerreL

 http://functions.wolfram.com/05.02.06.0002.01

 Input Form

 LaguerreL[n, z] == Sum[(Pochhammer[-n, k] z^k)/k!^2, {k, 0, n}]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["LaguerreL", "[", RowBox[List["n", ",", "z"]], "]"]], "\[Equal]", RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k", "=", "0"]], "n"], FractionBox[RowBox[List[RowBox[List["Pochhammer", "[", RowBox[List[RowBox[List["-", "n"]], ",", "k"]], "]"]], " ", SuperscriptBox["z", "k"]]], SuperscriptBox[RowBox[List["k", "!"]], "2"]]]]]]]]

 MathML Form

 L n ( z ) k = 0 n ( - n ) k TagBox[SubscriptBox[RowBox[List["(", RowBox[List["-", "n"]], ")"]], "k"], Pochhammer] z k k ! 2 LaguerreL n z k 0 n Pochhammer -1 n k z k k 2 -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["LaguerreL", "[", RowBox[List["n_", ",", "z_"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[UnderoverscriptBox["\[Sum]", RowBox[List["k", "=", "0"]], "n"], FractionBox[RowBox[List[RowBox[List["Pochhammer", "[", RowBox[List[RowBox[List["-", "n"]], ",", "k"]], "]"]], " ", SuperscriptBox["z", "k"]]], SuperscriptBox[RowBox[List["(", RowBox[List["k", "!"]], ")"]], "2"]]]]]]]]

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

 2001-10-29