#1905 Solving equations with logarithms

[traxi]

(%i1) solve([log(x)*x=0], [x]);
(%o1) [x=1,x=0]

Should only be [x=1,x=0]

[traxi]

Should only be x=1

[Barton Willis]

The alternative solver (to_poly_solve) can not solve this equation either:

(%i13) load(to_poly_solver)$
(%i12) %solve([log(x)*x=0], [x]);
Division by 0
(%o12) %union()

Thanks for this report--I'll try to fix to_poly_solve function.

[Stavros Macrakis]

I think you mean "should only be [x=1]".

Maxima actually got lucky here, because x=0 is arguably a solution by continuity, since limit(log(x)*x,x,0) = 0 (even for negative x).

[traxi]

I'm only interested in real results.
Is it possible to configure maxima, ony to get real results in this case?

[Nobody/Anonymous]

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[Dieter Kaiser]

As mentioned in a posting below, the solution x=0 might be considered as a solution too.
Setting the resolution to Wont Fix and the status to pending.
Dieter Kaiser

[SourceForge Robot]

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