Hmm. OK, thanks guys. This still leaves the question, though -
shouldn't Maxima either a) call the risch function when integrate is
handed something it can't do or b) at the very least not return a wrong
answer?
CY
--- Richard Fateman <fateman@cs.berkeley.edu> wrote:
> The del comes from not giving the 2nd arg to diff. try diff(%,x)
> instead of diff(%).
> RJF
>
>
> Valerij Pipin wrote:
>
> > Well,
> > In macsyma there is another integrator to deal with transcendental
> functions
> > (C1) risch(3^log(x),x);
> > LOG(3) LOG(x)
> > x %E
> > (D1) -----------------
> > LOG(3) + 1
> > So, it's correct. However differentiation gives a delta
> > (C2) diff(%);
> > LOG(3) LOG(x) LOG(3) LOG(x)
> > LOG(3) %E %E
> > (D2) (---------------------- + ---------------) DEL(x)
> > LOG(3) + 1 LOG(3) + 1
> > (C3) factor(%);
> > LOG(3) LOG(x)
> > (D3) %E DEL(x)
> >
> >
>
>
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