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[Mathematica 5.1] Bug Report - Two numerical values for a same variable


Hi,

Mathematica v5.1 is much better than v5.0 on the accuracy of 
integration. I am not talking about numerical accuracy---v5.0 sometimes 
gives out two answers that are off by a constant for the same input.

However, I still get two different numerical values for a same variable 
in v5.1

a=Exp[Integrate[(Cos[w]-Exp[-w^2/2]*Cos[23/100*w])/w, {w, 0, Infinity}]]
N[a]
N[a,20]

Thanks for looking into this problem.
--Ling


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