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 Fibonacci

 http://functions.wolfram.com/04.11.17.0007.01

 Input Form

 Fibonacci[\[Nu] + 1] Fibonacci[\[Nu] - 1] - Fibonacci[\[Nu]]^2 == Cos[\[Nu] Pi]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[RowBox[List[RowBox[List["Fibonacci", "[", RowBox[List["\[Nu]", "+", "1"]], "]"]], RowBox[List["Fibonacci", "[", RowBox[List["\[Nu]", "-", "1"]], "]"]]]], "-", SuperscriptBox[RowBox[List["Fibonacci", "[", "\[Nu]", "]"]], "2"]]], "\[Equal]", RowBox[List["Cos", "[", RowBox[List["\[Nu]", " ", "\[Pi]"]], "]"]]]]]]

 MathML Form

 F TagBox["F", Fibonacci] ν + 1 F TagBox["F", Fibonacci] ν - 1 - F TagBox["F", Fibonacci] ν 2 cos ( ν π ) Fibonacci ν 1 Fibonacci ν -1 -1 Fibonacci ν 2 ν [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List[RowBox[List[RowBox[List["Fibonacci", "[", RowBox[List["\[Nu]_", "+", "1"]], "]"]], " ", RowBox[List["Fibonacci", "[", RowBox[List["\[Nu]_", "-", "1"]], "]"]]]], "-", SuperscriptBox[RowBox[List["Fibonacci", "[", "\[Nu]_", "]"]], "2"]]], "]"]], "\[RuleDelayed]", RowBox[List["Cos", "[", RowBox[List["\[Nu]", " ", "\[Pi]"]], "]"]]]]]]

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

 2001-10-29