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<B>BESSELJ</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
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The <em>BesselJ</em> operator returns the Bessel function of the first kind. 
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syntax: </H3>
<em>BesselJ</em>(&lt;order&gt;,&lt;argument&gt;) 
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examples: </H3>
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BesselJ(1/2,pi); 

  0 


on rounded; 

BesselJ(0,1); 

  0.765197686558  

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