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