On Sep 19, 12:50 am, "William Stein" <[EMAIL PROTECTED]> wrote:
> > sage: FormalSum([(1,1/4),(1,-1/5)])
> > -1/5 + 1/4
> > sage: FormalSum([(1,1/4),(1,-1/5)]) == 1/4 - 1/5
> > False
>
> That could be considered a bug and fixed. I would
> be fine with something better, i.e., comparison computing
> the value of the formal sum if possible, and comparing them.
That would horribly break my group algebras class, which is based on
FormalSum. Couldn't one add a method evaluate() to the FormalSum
class, so we'd have
sage: FormalSum([(1,1/4),(1,-1/5)]) == 1/4 - 1/5
False
sage: FormalSum([(1,1/4),(1,-1/5)]).evaluate() == 1/4 - 1/5
True
?
David
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