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 KroneckerDelta

 http://functions.wolfram.com/04.24.27.0002.01

 Input Form

 KroneckerDelta[n] == DiscreteDelta[Subscript[n, 1], Subscript[n, 2], \[Ellipsis], Subscript[n, m]] /; Subscript[n, 1] == n && m == 1

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["KroneckerDelta", "[", "n", "]"]], "\[Equal]", RowBox[List["DiscreteDelta", "[", RowBox[List[SubscriptBox["n", "1"], ",", SubscriptBox["n", "2"], ",", "\[Ellipsis]", ",", SubscriptBox["n", "m"]]], "]"]]]], "/;", RowBox[List[RowBox[List[SubscriptBox["n", "1"], "\[Equal]", "n"]], "\[And]", RowBox[List["m", "\[Equal]", "1"]]]]]]]]

 MathML Form

 δ KroneckerDelta n δ DiscreteDelta ( n 1 , n 2 , , n m ) /; n 1 n m 1 Condition KroneckerDelta n DiscreteDelta Subscript n 1 Subscript n 2 Subscript n m Subscript n 1 n m 1 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["KroneckerDelta", "[", "n_", "]"]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List["DiscreteDelta", "[", RowBox[List[SubscriptBox["nn", "1"], ",", SubscriptBox["nn", "2"], ",", "\[Ellipsis]", ",", SubscriptBox["nn", "m"]]], "]"]], "/;", RowBox[List[RowBox[List[SubscriptBox["nn", "1"], "\[Equal]", "n"]], "&&", RowBox[List["m", "\[Equal]", "1"]]]]]]]]]]

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

 2007-05-02