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<A NAME=FACTORIAL>

<TITLE>FACTORIAL</TITLE></A>
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<B>FACTORIAL</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
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syntax: </H3>
<em>factorial</em>(&lt;expression&gt;) 
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If the argument of <em>factorial</em> is a positive integer or zero, its 
factorial is returned. Otherwise the result is expressed in terms of the 
original operator. For more general operations, the 
<A HREF=r37_0491.html>gamma</A> operator 
is available in the 
<A HREF=r37_0443.html>Special Function Package</A>. 
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examples: </H3>
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factorial 4; 

  24 


factorial 30 ; 

  265252859812191058636308480000000 

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