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<B>ERFI</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
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The <em>erfi</em> operator returns the error function of an imaginary argument. 

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erfi(~x) =&gt; 2/sqrt(pi) * defint(e**(t**2),t,0,x); 
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syntax: </H3>
<em>erfi</em>(&lt;argument&gt;) 
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This operator is sometimes included in the result of the simplification 
of a generalized 
<A HREF=r37_0528.html>hypergeometric</A> function or a 

<A HREF=r37_0529.html>MeijerG</A> function. 
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No simplification is done for this function. 
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