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 DiscreteDelta

 http://functions.wolfram.com/04.19.27.0001.01

 Input Form

 DiscreteDelta[Subscript[n, 1], Subscript[n, 2], \[Ellipsis], Subscript[n, m]] == KroneckerDelta[Subscript[n, 1], Subscript[n, 2], \[Ellipsis], Subscript[n, m], 0]

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List["DiscreteDelta", "[", RowBox[List[SubscriptBox["n", "1"], ",", SubscriptBox["n", "2"], ",", "\[Ellipsis]", ",", SubscriptBox["n", "m"]]], "]"]], "\[Equal]", RowBox[List["KroneckerDelta", "[", RowBox[List[SubscriptBox["n", "1"], ",", SubscriptBox["n", "2"], ",", "\[Ellipsis]", ",", SubscriptBox["n", "m"], ",", "0"]], "]"]]]]]]

 MathML Form

 δ DiscreteDelta ( n 1 , n 2 , , n m ) δ KroneckerDelta n 1 , n 2 , , n m , 0 DiscreteDelta Subscript n 1 Subscript n 2 Subscript n m KroneckerDelta Subscript n 1 Subscript n 2 Subscript n m 0 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["DiscreteDelta", "[", RowBox[List[SubscriptBox["n_", "1"], ",", SubscriptBox["n_", "2"], ",", "\[Ellipsis]_", ",", SubscriptBox["n_", "m_"]]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List["KroneckerDelta", "[", RowBox[List[SubscriptBox["nn", "1"], ",", SubscriptBox["nn", "2"], ",", "\[Ellipsis]", ",", SubscriptBox["nn", "m"], ",", "0"]], "]"]]]]]]

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

 2001-10-29