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   http://functions.wolfram.com/04.08.03.0010.01
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    GCD[n, LCM[m, n]] == n /; Element[m, Integers] && m > 0 && 
  Element[n, Integers] && n > 0 
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   Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["GCD", "[", RowBox[List["n", ",", RowBox[List["LCM", "[", RowBox[List["m", ",", "n"]], "]"]]]], "]"]], "\[Equal]", "n"]], "/;", RowBox[List[RowBox[List["m", "\[Element]", "Integers"]], "\[And]", RowBox[List["m", ">", "0"]], "\[And]", RowBox[List["n", "\[Element]", "Integers"]], "\[And]", RowBox[List["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>  <mrow>  <mi> gcd </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> n </mi>  <mo> , </mo>  <mrow>  <mi> lcm </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> m </mi>  <mo> , </mo>  <mi> n </mi>  </mrow>  <mo> ) </mo>  </mrow>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mi> n </mi>  </mrow>  <mo> /; </mo>  <mrow>  <mrow>  <mi> m </mi>  <mo> ∈ </mo>  <msup>  <mi> ℕ </mi>  <mo> + </mo>  </msup>  </mrow>  <mo> ∧ </mo>  <mrow>  <mi> n </mi>  <mo> ∈ </mo>  <msup>  <mi> ℕ </mi>  <mo> + </mo>  </msup>  </mrow>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <ci> Condition </ci>  <apply>  <eq />  <apply>  <gcd />  <ci> n </ci>  <apply>  <lcm />  <ci> m </ci>  <ci> n </ci>  </apply>  </apply>  <ci> n </ci>  </apply>  <apply>  <and />  <apply>  <in />  <ci> m </ci>  <apply>  <ci> SuperPlus </ci>  <ci> ℕ </ci>  </apply>  </apply>  <apply>  <in />  <ci> n </ci>  <apply>  <ci> SuperPlus </ci>  <ci> ℕ </ci>  </apply>  </apply>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["GCD", "[", RowBox[List["n_", ",", RowBox[List["LCM", "[", RowBox[List["m_", ",", "n_"]], "]"]]]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List["n", "/;", RowBox[List[RowBox[List["m", "\[Element]", "Integers"]], "&&", RowBox[List["m", ">", "0"]], "&&", RowBox[List["n", "\[Element]", "Integers"]], "&&", RowBox[List["n", ">", "0"]]]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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