Comment #1 on issue 2433 by ness...@googlemail.com: Polys module function poly() needs gens argument
http://code.google.com/p/sympy/issues/detail?id=2433
Also, it is slightly unfortunate then when generators *are* passed, and the coefficients contain irrationals like 2**(S(1)/3), then polys in the EX domain are created.
So I think there should be a way to say "build a polynomial using all the generators you like, and if you find none then use x".
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