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   http://functions.wolfram.com/13.07.30.0001.01
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    MoebiusMu[m n] == 0 /; GCD[m, n] > 1 
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   Cell[BoxData[RowBox[List[RowBox[List[RowBox[List["MoebiusMu", "[", RowBox[List["m", " ", "n"]], "]"]], "\[Equal]", "0"]], "/;", RowBox[List[RowBox[List["GCD", "[", RowBox[List["m", ",", "n"]], "]"]], ">", "1"]]]]]] 
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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>  <semantics>  <mi> μ </mi>  <annotation encoding='Mathematica'> TagBox["\[Mu]", MoebiusMu] </annotation>  </semantics>  <mo> ( </mo>  <mrow>  <mi> m </mi>  <mo> ⁢ </mo>  <mi> n </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> ⩵ </mo>  <mn> 0 </mn>  </mrow>  <mo> /; </mo>  <mrow>  <mrow>  <mi> gcd </mi>  <mo> ⁡ </mo>  <mo> ( </mo>  <mrow>  <mi> m </mi>  <mo> , </mo>  <mi> n </mi>  </mrow>  <mo> ) </mo>  </mrow>  <mo> > </mo>  <mn> 1 </mn>  </mrow>  </mrow>  <annotation-xml encoding='MathML-Content'>  <apply>  <ci> Condition </ci>  <apply>  <eq />  <apply>  <ci> MoebiusMu </ci>  <apply>  <times />  <ci> m </ci>  <ci> n </ci>  </apply>  </apply>  <cn type='integer'> 0 </cn>  </apply>  <apply>  <gt />  <apply>  <gcd />  <ci> m </ci>  <ci> n </ci>  </apply>  <cn type='integer'> 1 </cn>  </apply>  </apply>  </annotation-xml>  </semantics>  </math> 
   
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  | Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["MoebiusMu", "[", RowBox[List["m_", " ", "n_"]], "]"]], "]"]], "\[RuleDelayed]", RowBox[List["0", "/;", RowBox[List[RowBox[List["GCD", "[", RowBox[List["m", ",", "n"]], "]"]], ">", "1"]]]]]]]]  |  
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   Date Added to functions.wolfram.com (modification date)
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