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 | | http://functions.wolfram.com/06.27.06.0004.02 | 
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 | | Erfc[z] \[Proportional] 1 + O[z] | 
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 | | Cell[BoxData[RowBox[List[RowBox[List["Erfc", "[", "z", "]"]], "\[Proportional]", RowBox[List["1", "+", RowBox[List["O", "[", "z", "]"]]]]]]]] | 
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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> erfc </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  <mo> ∝ </mo>  <mrow>  <mn> 1 </mn>  <mo> + </mo>  <mrow>  <mi> O </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> z </mi>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <ci> Proportional </ci>  <apply>  <ci> Erfc </ci>  <ci> z </ci>  </apply>  <apply>  <plus />  <cn type='integer'> 1 </cn>  <apply>  <ci> O </ci>  <ci> z </ci>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
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 | | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Erfc", "[", "z_", "]"]], "]"]], "\[RuleDelayed]", RowBox[List["1", "+", RowBox[List["O", "[", "z", "]"]]]]]]]] | 
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 | | Date Added to functions.wolfram.com (modification date) | 
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