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 UnitStep

 http://functions.wolfram.com/14.02.02.0001.01

 Input Form

 UnitStep[Subscript[x, 1], Subscript[x, 2], \[Ellipsis]] == 1 /; Element[Subscript[x, k], Reals] && Subscript[x, k] >= 0

 Standard Form

 Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["UnitStep", "[", RowBox[List[SubscriptBox["x", "1"], ",", SubscriptBox["x", "2"], ",", "\[Ellipsis]"]], "]"]], "\[Equal]", "1"]], "/;", " ", RowBox[List[RowBox[List[SubscriptBox["x", "k"], "\[Element]", "Reals"]], "\[And]", " ", RowBox[List[SubscriptBox["x", "k"], "\[GreaterEqual]", "0"]]]]]]]]

 MathML Form

 θ UnitStep ( x 1 , x 2 , ) 1 /; x k TagBox["\[DoubleStruckCapitalR]", Function[Reals]] x k 0 Condition UnitStep Subscript x 1 Subscript x 2 1 Subscript x k Subscript x k 0 [/itex]

 Rule Form

 Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["UnitStep", "[", RowBox[List[SubscriptBox["x_", "1"], ",", SubscriptBox["x_", "2"], ",", "\[Ellipsis]_"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List["1", "/;", RowBox[List[RowBox[List[SubscriptBox["x", "k"], "\[Element]", "Reals"]], "&&", RowBox[List[SubscriptBox["x", "k"], "\[GreaterEqual]", "0"]]]]]]]]]]

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

 2001-10-29