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Improper integral


Bonjour le groupe,

I'm not a mathematician and I wonder why Mathematica doesn't return 0 
for this doubly infinite improper integral :

In[1]:=$Version
Out[1]=4.1 for Microsoft Windows (November 2, 2000)

In[2]:=Integrate[x/(1+x^2),{x,-Infinity,Infinity},PrincipalValue->True]
Integrate::idiv[...]does not converge[...]
Out[2]:=Integrate[x/(1+x^2),{x,-Infinity,Infinity},PrincipalValue->True]

maybe it's different with Mathematica 5.0 ?
---
jcp


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