Updates:
Summary: f (solve(e, k) hangs
Status: Fixed
Comment #8 on issue 1009 by smi...@gmail.com: f (solve(e, k) hangs
http://code.google.com/p/sympy/issues/detail?id=1009
chris>set SYMPY_USE_CACHE=no
h[1] >>> var("zz yy xx zy zx yx k")
(zz, yy, xx, zy, zx, yx, k)
h[2] >>> e1=(zz-k)*(yy-k)*(xx-k) + zy*yx*zx + zx-zy-yx
h[2] >>> e2=(zz-k)*yx*yx + zx*(yy-k)*zx + zy*zy*(xx-k)
h[2] >>> e=e1-e2
h[2] >>> soln=solve(e,k)
h[2] >>> count_ops(soln,visual=1)
33*NEG + 125*ADD + 148*POW + 173*MUL + 177*DIV + 191*SUB
h[3] >>> e.is_zero
h[3] >>> e.expand().is_zero
...after about 30 seconds it returns None, same as with cache on
h[4] >>>
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