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 Fibonacci

 http://functions.wolfram.com/07.06.04.0003.01

 Input Form

 Fibonacci[-n, z] == (-1)^(n - 1) Fibonacci[n, z] /; Element[n, Integers]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["Fibonacci", "[", RowBox[List[RowBox[List["-", "n"]], ",", "z"]], "]"]], "\[Equal]", RowBox[List[SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["n", "-", "1"]]], RowBox[List["Fibonacci", "[", RowBox[List["n", ",", "z"]], "]"]]]]]], "/;", " ", RowBox[List["n", "\[Element]", "Integers"]]]]]]

 MathML Form

 F TagBox["F", Fibonacci] - n ( z ) ( - 1 ) n - 1 F TagBox["F", Fibonacci] n ( z ) /; n TagBox["\[DoubleStruckCapitalZ]", Function[Integers]] Condition Fibonacci -1 n z -1 n -1 Fibonacci n z n [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Fibonacci", "[", RowBox[List[RowBox[List["-", "n_"]], ",", "z_"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List[SuperscriptBox[RowBox[List["(", RowBox[List["-", "1"]], ")"]], RowBox[List["n", "-", "1"]]], " ", RowBox[List["Fibonacci", "[", RowBox[List["n", ",", "z"]], "]"]]]], "/;", RowBox[List["n", "\[Element]", "Integers"]]]]]]]]

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

 2001-10-29