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   http://functions.wolfram.com/01.34.19.0004.01
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    Arg[Infinity] == ArcTan[Max[Subscript[x, 1], Subscript[x, 2], \[Ellipsis], 
   Subscript[x, n]], 0] 
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   Cell[BoxData[RowBox[List[RowBox[List["Arg", "[", InterpretationBox[InterpretationBox[RowBox[List["Max", "[", RowBox[List[SubscriptBox["x", "1"], ",", SubscriptBox["x", "2"], ",", "\[Ellipsis]", ",", SubscriptBox["x", "n"]]], "]"]], DirectedInfinity[1]], DirectedInfinity[1]], "]"]], "\[Equal]", RowBox[List["ArcTan", "[", RowBox[List[RowBox[List["Max", "[", RowBox[List[SubscriptBox["x", "1"], ",", SubscriptBox["x", "2"], ",", "\[Ellipsis]", ",", SubscriptBox["x", "n"]]], "]"]], ",", "0"]], "]"]]]]]] 
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   <math xmlns='http://www.w3.org/1998/Math/MathML' mathematica:form='TraditionalForm' xmlns:mathematica='http://www.wolfram.com/XML/'>  <semantics>  <mrow>  <mrow>  <mi> arg </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <semantics>  <mrow>  <mi> max </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <msub>  <mi> x </mi>  <mn> 1 </mn>  </msub>  <mo> , </mo>  <msub>  <mi> x </mi>  <mn> 2 </mn>  </msub>  <mo> , </mo>  <mo> … </mo>  <mo> , </mo>  <msub>  <mi> x </mi>  <mi> n </mi>  </msub>  </mrow>  <mo> ) </mo>  </mrow>  <annotation-xml encoding='MathML-Content'>  <infinity />  </annotation-xml>  </semantics>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mrow>  <msup>  <mi> tan </mi>  <mrow>  <mo> - </mo>  <mn> 1 </mn>  </mrow>  </msup>  <mo> ( </mo>  <mrow>  <mrow>  <mi> max </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <msub>  <mi> x </mi>  <mn> 1 </mn>  </msub>  <mo> , </mo>  <msub>  <mi> x </mi>  <mn> 2 </mn>  </msub>  <mo> , </mo>  <mo> … </mo>  <mo> , </mo>  <msub>  <mi> x </mi>  <mi> n </mi>  </msub>  </mrow>  <mo> ) </mo>  </mrow>  <mo> , </mo>  <mn> 0 </mn>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <arg />  <apply>  <ci> DirectedInfinity </ci>  <cn type='integer'> 1 </cn>  </apply>  </apply>  <apply>  <arctan />  <apply>  <max />  <apply>  <ci> Subscript </ci>  <ci> x </ci>  <cn type='integer'> 1 </cn>  </apply>  <apply>  <ci> Subscript </ci>  <ci> x </ci>  <cn type='integer'> 2 </cn>  </apply>  <ci> … </ci>  <apply>  <ci> Subscript </ci>  <ci> x </ci>  <ci> n </ci>  </apply>  </apply>  <cn type='integer'> 0 </cn>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Arg", "[", "\[Infinity]", "]"]], "]"]], "\[RuleDelayed]", RowBox[List["ArcTan", "[", RowBox[List[RowBox[List["Max", "[", RowBox[List[SubscriptBox["x", "1"], ",", SubscriptBox["x", "2"], ",", "\[Ellipsis]", ",", SubscriptBox["x", "n"]]], "]"]], ",", "0"]], "]"]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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