They need to be positive. Even for integer x, sqrt(x**2) != x if x is negative.
Aaron Meurer
On Fri, Dec 5, 2014 at 3:34 PM, Francesco Bonazzi
<franz.bona...@gmail.com> wrote:
> newvars =symbols('x a b', integer=True)
> e.xreplace(dict(zip([x,a,b], newvars)))
>
> I did not test this.
>
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