That's a *bug*.
The behavior of FiniteSet while having symbolic elements into it
was recently changed here: https://github.com/sympy/sympy/pull/9540
So, the new behavior, is yet not implemented for all other operations,
that's probably one of the reasons for this.
*AMiT Kumar*
On Saturday, July 11, 2015 at 12:09:21 PM UTC+5:30, Gaurav Dhingra wrote:
>
> Hi all
> Currently we have
> ```
> >>> m,n = symbols('m n')
> >>> Finite(1,2,3) - FiniteSet(m,n)
> FiniteSet(1, 2, 3) # why this ? Why is it not returned unevaluated ?
> ```
>
> Gaurav
>
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