On Tue, 18 May 2010 12:21:57 -0700 (PDT), John Cremona <john.crem...@gmail.com>
wrote:
>
> I think it is a bug.
> sage: p.prec()
> 1
> sage: p(t).prec()
> +Infinity
> sage: p(t^2).prec()
> +Infinity
>
> The precision of the composite is not being computed correctly. I
> hope someone more familiar with the power series code will jump in at
> this point.
This type of thing has been noticed before (a couple of times!), see
http://trac.sagemath.org/sage_trac/ticket/3979
http://trac.sagemath.org/sage_trac/ticket/5367
I guess it might be time to fix these :)
Best,
Alex
--
Alex Ghitza -- http://aghitza.org/
Lecturer in Mathematics -- The University of Melbourne -- Australia
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