>
> On 25/06/2017 16:51, baliza Eyo wrote:
> > Dear Sage developers,
> >
> > Here is a quick question about the output of the .coefficient() for an
> SR
> > object.
> > having set up the variables as follows
> >
> > sage: var('x,y')
> > (x, y)
> >
> > Shouldn't the output of the following commands be the same:
> >
> > sage: ((x^2 - 2)^2 - y^2).coefficient(x^4)
> > 0
> > sage: expand(((x^2 - 2)^2 - y^2)).coefficient(x^4)
> > 1
> > sage: ((x^2 - 2)^2 - y^2).diff(x,4).subs(x==0)/factorial(4)
> > 1
> >
> > The last two outputs are correct but why is 0 the intended output for
> > ((x^2 - 2)^2 - y^2).coefficient(x^4) ?
>
I agree that this is unintuitive, but this is a well-documented behavior.
Check this out.
sage: f=((x^2 - 2)^2 - y^2)
sage: f.coefficient?
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