I think it's just the assumptions. If you check Symbol.__eq__, it
checks just the name and the assumptions.
Aaron Meurer
On Fri, Feb 15, 2013 at 5:01 PM, Matthew Rocklin <mrock...@gmail.com> wrote:
> What is the list of attributes that need to be passed on to faithfully
> reconstruct a Symbol?
>
> Most sympy classes can be reconstructed as follows
>
> foo == type(foo)(*foo.args)
>
> Some classes break this rule. For example
>
> i = Integer(3)
> i == type(i)(i.p)
>
> r = Rational(2, 3)
> r == type(r)(r.p, r.q)
>
> I thought i could do the same thing with symbol
>
> s = Symbol('x')
> s == type(s)(s.name)
>
> but it doesn't work with old assumptions
>
> s = Symbol('x', positive=True)
> s != type(s)(s.name)
>
> What is the list of attributes that need to be passed on to faithfully
> reconstruct a Symbol?
>
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