Updates:
Status: Accepted
Labels: Assumptions Solvers
Comment #1 on issue 3078 by [email protected]: Adding a "real" keyword to
solve()
http://code.google.com/p/sympy/issues/detail?id=3078
I think what we should do is allow to pass in new style assumptions as
arguments to solve somehow (perhaps just as another equation). For
example, something like solve([x**3 - 1, Q.real(x)], x) or solve(x**3 - 1,
x, assumptions=Q.real(x)). That would be much more expressive than a
handful of predetermined keyword args, and less ambiguous.
Of course, for now, you can just define x to be real initially (x =
Symbol('x', real=True)), and it will do what you want. If you don't want
to do that for some reason, you could filter the solutions with something
like [i for i in sols if i.is_real].
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