I know this way, but is there any way to change this after symbol creation?
On Thursday, December 4, 2014 6:29:27 PM UTC+2, Ondřej Čertík wrote:
>
> On Thu, Dec 4, 2014 at 7:38 AM, Paul Royik <distan...@gmail.com
> <javascript:>> 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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