Eddy Xiao wrote:
> 
> Hi, I'm trying you new integration code, and
> 
> integrate(x^(1/3)/(3*x+1)^(1/3), x)
> =20
>    >> Error detected within library code:
>    impossible
> 
> what does this "impossible" mean? Is it a bug?

Yes, it is a bug.  "impossible" mean that some condition happened
that author of the code (probably me) thought should never
happen.  It may be mistake in a proof or some other place is
passing wrong values.

> 
> BTW: Is sourceforge.net/p/fricas/bugs/ the proper place to report bug?

Yes.

BTW: The bug is present from some time, at least from release 1.2.3.

-- 
                              Waldek Hebisch
[email protected] 

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