> I am not an expert for that part of Sage. But I would expect the > output "[]" *only* if it is certain that there is no solution. I > interprete the ValueError in the sense of "sorry, I can't solve this > equation, and I can't prove the absence of solutions either".
That is the hope, yes, though I am sure there are counterexamples to both. Maxima cannot solve this, with or without to_poly_solve, so that is why there is no solution found. - kcrisman
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