
<A NAME=POLYGAMMA>

<TITLE>POLYGAMMA</TITLE></A>
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<B>POLYGAMMA</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
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The <em>Polygamma</em> operator returns the Polygamma function. 
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Polygamma(n,x) := df(Psi(z),z,n); 
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syntax: </H3>
<em>Polygamma</em>(&lt;integer&gt;,&lt;expression&gt;) 
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examples: </H3>
<P><PRE><TT>
 Polygamma(1,2); 

     2
  (pi   - 6) / 6


on rounded; 

Polygamma(1,2.35); 

  0.52849689109

</TT></PRE><P>The Polygamma function is used for simplification of the 
<A HREF=r37_0449.html>ZETA</A> 
function for some arguments. 
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