Re: How to help Mathematica take an integral
- To: mathgroup at smc.vnet.net
- Subject: [mg81885] Re: How to help Mathematica take an integral
- From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
- Date: Sat, 6 Oct 2007 04:30:35 -0400 (EDT)
- Organization: The Open University, Milton Keynes, UK
- References: <fe4udu$12q$1@smc.vnet.net>
Aaron Fude wrote:
> 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?
What about the following?
In[1]:= int = Integrate[Erf[Log[t]], {t, 0, x}]
Out[1]= x Erf[Log[x]] - \[ExponentialE]^(1/4) Erfc[1/2 - Log[x]]
In[2]:= FullSimplify[D[int, x], Assumptions -> x > 0]
Out[2]= Erf[Log[x]]
Regards,
--
Jean-Marc