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   http://functions.wolfram.com/08.05.04.0003.01
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    EllipticF[z + k Pi, m] == EllipticF[z, m] + 2 k EllipticK[m] /; 
 Element[k, Integers] 
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   Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["EllipticF", "[", RowBox[List[RowBox[List["z", "+", RowBox[List["k", " ", "\[Pi]"]]]], ",", "m"]], "]"]], "\[Equal]", RowBox[List[RowBox[List["EllipticF", "[", RowBox[List["z", ",", "m"]], "]"]], "+", RowBox[List["2", " ", "k", " ", RowBox[List["EllipticK", "[", "m", "]"]]]]]]]], "/;", RowBox[List["k", "\[Element]", "Integers"]]]]]] 
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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>  <mrow>  <mi> F </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mrow>  <mi> z </mi>  <mo> + </mo>  <mrow>  <mi> π </mi>  <mo> ⁢ </mo>  <mi> k </mi>  </mrow>  </mrow>  <mo> ❘ </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mrow>  <mrow>  <mi> F </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> z </mi>  <mo> ❘ </mo>  <mi> m </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> + </mo>  <mrow>  <mn> 2 </mn>  <mo> ⁢ </mo>  <mi> k </mi>  <mo> ⁢ </mo>  <mrow>  <mi> K </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mi> m </mi>  <mo> ) </mo>  </mrow>  </mrow>  </mrow>  </mrow>  <mo> /; </mo>  <mrow>  <mi> k </mi>  <mo> ∈ </mo>  <semantics>  <mi> ℤ </mi>  <annotation encoding='Mathematica'> TagBox["\[DoubleStruckCapitalZ]", Function[Integers]] </annotation>  </semantics>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <ci> Condition </ci>  <apply>  <eq />  <apply>  <ci> EllipticF </ci>  <apply>  <plus />  <ci> z </ci>  <apply>  <times />  <pi />  <ci> k </ci>  </apply>  </apply>  <ci> m </ci>  </apply>  <apply>  <plus />  <apply>  <ci> EllipticF </ci>  <ci> z </ci>  <ci> m </ci>  </apply>  <apply>  <times />  <cn type='integer'> 2 </cn>  <ci> k </ci>  <apply>  <ci> EllipticK </ci>  <ci> m </ci>  </apply>  </apply>  </apply>  </apply>  <apply>  <in />  <ci> k </ci>  <integers />  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["EllipticF", "[", RowBox[List[RowBox[List["z_", "+", RowBox[List["k", " ", "\[Pi]"]]]], ",", "m_"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List[RowBox[List[RowBox[List["EllipticF", "[", RowBox[List["z", ",", "m"]], "]"]], "+", RowBox[List["2", " ", "k", " ", RowBox[List["EllipticK", "[", "m", "]"]]]]]], "/;", RowBox[List["k", "\[Element]", "Integers"]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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