Re: Sage days
William Stein
> Hi Will:
>
> I look forward to seeing you soon at Sage days. I will be there only for
> Tuesday evening and all of Wednesday, and wanted to discuss a few things
> with you during my limited stay. One of them is our paper on torsion,
> cuspidal group, etc. I am attaching a latex and pdf version of a skeleton of
> the paper (this is essentially the same as the one I emailed you about a
> month ago). If you can take a look at it before we meet, that would be nice.
> The other thing that I may want to ask you about is your paper on
> Gross-Zagier subgroups -- I plan to read it on the flight more carefully and
> may have some questions. I was wondering if we can meet for say an hour on
> Tuesday night -- e.g., over dinner would be fine.
Why don't we block in ALL of Tuesday evening to work together?
> There is one more thing that I would like to discuss with you and others:
> the issue of computing congruences between spaces of cusp forms. With regard
> to our paper, when I was checking whether a newform is congruent modulo a
> prime ideal over a given prime p to an old eigenform, the computations on
> sage slowed down very quickly as the level increased (at around 250). I
> think I may have a faster algorithm to do this when p^2 does not divide the
> level. I have given my student Randy Heaton the task of figuring out the
> details and implementing the algorithm, and he may talk to people at Sage
> days about it before I get there. I thought that it might be easiest if I
> give a short informal talk on my plan, mainly to get any
> comments/criticism/suggestions from people at Sage days, provided this issue
> is of interest to several others (this could be more efficient than talking
> to one person at a time). Let me know if that sounds like a good idea and
> is feasible.
That's a perfect idea for a Sage Days project. Send a description to
the sagedays17 mailing list ASAP. You could also post something to
the wiki.
William