On Thu, Dec 4, 2014 at 7:38 AM, Paul Royik <[email protected]> wrote:
> Suppose that I have an expression
>
> e = x**2+sqrt(a**2*b**2)
> What is the best way to assign to expression assumption that all variables
> are Positive, so that equivalent of e is x**2+ab?
It should be done like this:
In [11]: refine(e, Q.positive(a) & Q.positive(b))
Out[11]:
_______
2 ╱ 2 2
x + ╲╱ a ⋅b
But unfortunately that doesn't work. So the only other way is the old
way like this:
In [12]: a = Symbol("a", positive=True)
In [13]: b = Symbol("b", positive=True)
In [14]: x**2+sqrt(a**2*b**2)
Out[14]:
2
a⋅b + x
Ondrej
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