It can't solve for x in x*log(x)=u.
Can you?
RJF
> -----Original Message-----
> From: maxima-bounces at math.utexas.edu
> [mailto:maxima-bounces at math.utexas.edu] On Behalf Of Milan Lukic
> Sent: Sunday, September 23, 2007 9:21 PM
> To: maxima at math.utexas.edu
> Subject: Changevar
>
> It seems (to me) that Maxima is unable to perform the change of
> variable x*log(x)=u in the integral of
> (log(x)+1)*sqrt(1+(x*log(x))^2). Namely,
>
> (%i3) A : 'integrate((log(x)+1)*sqrt(1+(x*log(x))^2),x);
> (%i4) changevar(A,x*log(x)-u,u,x);
>
> returns the original integral. BTW, it can't find the antiderivative
> either.
>
> Milan
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