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Re: How to help Mathematica take an integral

  • To: mathgroup at smc.vnet.net
  • Subject: [mg81915] Re: How to help Mathematica take an integral
  • From: "David W.Cantrell" <DWCantrell at sigmaxi.net>
  • Date: Sat, 6 Oct 2007 04:46:02 -0400 (EDT)
  • References: <fe4udu$12q$1@smc.vnet.net>

Aaron Fude <aaronfude at gmail.com> wrote:
> Hi,
>
> I would like to evaluate the indefinite integral of Erf[Log[x]].
> Mathematica seems to be able to do any definite integral, but not the
> indefinite version. Is there anything I can do to help Mathematica
> along?

I don't understand why you're having a problem. Using version 5.2 at least,
there is no need to help Mathematica:

In[5]:= Integrate[Erf[Log[x]], x]

Out[5]= (-E^(1/4))*Erf[-(1/2) + Log[x]] + x*Erf[Log[x]]

David


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