Comment #50 on issue 1694 by nicolas.pourcelot: solve has many issues with
fractions
http://code.google.com/p/sympy/issues/detail?id=1694
I use f.as_numer_denom() only for Mul or Pow.
But in case of GS_POLY_CV_1 strategy, checksol() is used for an Add.
(line 322)
for sol in cv_sols:
# We might have introduced unwanted solutions,
# so we test solutions. cf. Issue 1387
# Note that when checksol() can not conclude (returns None),
# we keep the potential solution.
sol_m = sol**m
if checksol(f, symbol, sol_m) is not False: # True or None
result.append(sol_m)
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