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variants of this functions
Factorial2




Mathematica Notation

Traditional Notation









Gamma, Beta, Erf > Factorial2[n] > Specific values > Values at fixed points





http://functions.wolfram.com/06.02.03.0010.01









  


  








Input Form





1!! == 1








Standard Form





Cell[BoxData[RowBox[List[RowBox[List["1", "!!"]], "\[Equal]", "1"]]]]








MathML Form







<math xmlns='http://www.w3.org/1998/Math/MathML' mathematica:form='TraditionalForm' xmlns:mathematica='http://www.wolfram.com/XML/'> <semantics> <mrow> <mrow> <mn> 1 </mn> <mo> !! </mo> </mrow> <mo> &#10869; </mo> <mn> 1 </mn> </mrow> <annotation-xml encoding='MathML-Content'> <apply> <eq /> <apply> <ci> Factorial2 </ci> <cn type='integer'> 1 </cn> </apply> <cn type='integer'> 1 </cn> </apply> </annotation-xml> </semantics> </math>










Rule Form





Cell[BoxData[RowBox[List[RowBox[List["HoldPattern", "[", RowBox[List["1", "!!"]], "]"]], "\[RuleDelayed]", "1"]]]]


Date Added to functions.wolfram.com (modification date)





2001-10-29