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   http://functions.wolfram.com/04.02.19.0011.01
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    Sign[Ceiling[x + I y]] == Ceiling[x + I y]/Abs[Ceiling[x + I y]] 
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   Cell[BoxData[RowBox[List[RowBox[List["Sign", "[", RowBox[List["Ceiling", "[", RowBox[List["x", "+", RowBox[List["\[ImaginaryI]", " ", "y"]]]], "]"]], "]"]], "\[Equal]", FractionBox[RowBox[List["Ceiling", "[", RowBox[List["x", "+", RowBox[List["\[ImaginaryI]", " ", "y"]]]], "]"]], RowBox[List["Abs", "[", RowBox[List["Ceiling", "[", RowBox[List["x", "+", RowBox[List["\[ImaginaryI]", " ", "y"]]]], "]"]], "]"]]]]]]] 
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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> sgn </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mo> ⌈ </mo>  <mrow>  <mi> x </mi>  <mo> + </mo>  <mrow>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mi> y </mi>  </mrow>  </mrow>  <mo> ⌉ </mo>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mfrac>  <mrow>  <mo> ⌈ </mo>  <mrow>  <mi> x </mi>  <mo> + </mo>  <mrow>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mi> y </mi>  </mrow>  </mrow>  <mo> ⌉ </mo>  </mrow>  <mrow>  <semantics>  <mo> ❘ </mo>  <annotation encoding='Mathematica'> "\[LeftBracketingBar]" </annotation>  </semantics>  <mrow>  <mo> ⌈ </mo>  <mrow>  <mi> x </mi>  <mo> + </mo>  <mrow>  <mi> ⅈ </mi>  <mo> ⁢ </mo>  <mi> y </mi>  </mrow>  </mrow>  <mo> ⌉ </mo>  </mrow>  <semantics>  <mo> ❘ </mo>  <annotation encoding='Mathematica'> "\[RightBracketingBar]" </annotation>  </semantics>  </mrow>  </mfrac>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <eq />  <apply>  <ci> Sign </ci>  <apply>  <ceiling />  <apply>  <plus />  <ci> x </ci>  <apply>  <times />  <imaginaryi />  <ci> y </ci>  </apply>  </apply>  </apply>  </apply>  <apply>  <times />  <apply>  <ceiling />  <apply>  <plus />  <ci> x </ci>  <apply>  <times />  <imaginaryi />  <ci> y </ci>  </apply>  </apply>  </apply>  <apply>  <power />  <apply>  <abs />  <apply>  <ceiling />  <apply>  <plus />  <ci> x </ci>  <apply>  <times />  <imaginaryi />  <ci> y </ci>  </apply>  </apply>  </apply>  </apply>  <cn type='integer'> -1 </cn>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["Sign", "[", RowBox[List["Ceiling", "[", RowBox[List["x_", "+", RowBox[List["\[ImaginaryI]", " ", "y_"]]]], "]"]], "]"]], "]"]], "\[RuleDelayed]", FractionBox[RowBox[List["Ceiling", "[", RowBox[List["x", "+", RowBox[List["\[ImaginaryI]", " ", "y"]]]], "]"]], RowBox[List["Abs", "[", RowBox[List["Ceiling", "[", RowBox[List["x", "+", RowBox[List["\[ImaginaryI]", " ", "y"]]]], "]"]], "]"]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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