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 BesselK

 http://functions.wolfram.com/03.04.27.0002.01

 Input Form

 BesselI[\[Nu], z] BesselK[\[Nu] + 1, z] + BesselI[\[Nu] + 1, z] BesselK[\[Nu], z] == 1/z

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[RowBox[List[RowBox[List["BesselI", "[", RowBox[List["\[Nu]", ",", "z"]], "]"]], " ", RowBox[List["BesselK", "[", RowBox[List[RowBox[List["\[Nu]", "+", "1"]], ",", "z"]], "]"]]]], "+", RowBox[List[RowBox[List["BesselI", "[", RowBox[List[RowBox[List["\[Nu]", "+", "1"]], ",", "z"]], "]"]], " ", RowBox[List["BesselK", "[", RowBox[List["\[Nu]", ",", "z"]], "]"]]]]]], "\[Equal]", FractionBox["1", "z"]]]]]

 MathML Form

 I ν ( z ) K ν + 1 ( z ) + I ν + 1 ( z ) K ν ( z ) 1 z BesselI ν z BesselK ν 1 z BesselI ν 1 z BesselK ν z 1 z -1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List[RowBox[List[RowBox[List["BesselI", "[", RowBox[List["\[Nu]_", ",", "z_"]], "]"]], " ", RowBox[List["BesselK", "[", RowBox[List[RowBox[List["\[Nu]_", "+", "1"]], ",", "z_"]], "]"]]]], "+", RowBox[List[RowBox[List["BesselI", "[", RowBox[List[RowBox[List["\[Nu]_", "+", "1"]], ",", "z_"]], "]"]], " ", RowBox[List["BesselK", "[", RowBox[List["\[Nu]_", ",", "z_"]], "]"]]]]]], "]"]], "\[RuleDelayed]", FractionBox["1", "z"]]]]]

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

 2001-10-29