On Tue, Feb 23, 2010 at 10:18 AM, David Roe <r...@math.harvard.edu> wrote: > Hey all, > I have two series of patches I've been working on and need some help > reviewing them. > > The first implements coercion within lattices of finite fields. So you can > now do the following: >
What definitions do you use to do coercions? If I remember correctly, the definition of what Magma does (the only other system I know of with coercions) is very unclear and not so well defined. > sage: k = GF(9) > sage: l = GF(27) > sage: x = k.gen() + l.gen(); x > z6^5 + 2*z6^4 + 2*z6^3 + z6^2 + 2*z6 + 1 > sage: x.parent() > Finite Field in z6 of size 3^6 > sage: K.<a> = GF(2^1000) > sage: K.subfields() > <big list of subfields of K with embeddings into K> > > Along the way I've moved the finite rings into their own folder > (sage.rings.finite_rings), moved finite fields and orders of number fields > to the new coercion system, sped up nth roots in finite fields and > IntegerMods and more. This is the series of tickets > #8218 -> #8332 -> #7880 -> #7883 -> #8333 -> #8334 -> #8335, > and they all need review. > > The second is a collection of changes to p-adic polynomials at ticket > #6084. It's not quite ready for review, but it's been languishing for the > summer and I could use some help looking at it. Kiran has volunteered, but > there's a lot of code there and he'd like some assistance. The idea behind > the changes is to try to split off the precision and coefficient data for > p-adic polynomials and model them separately. This allows one to work with > different styles of precision (newton polygons, list of absolute precisions, > flat precisions) attached to different coefficient implementations (FLINT > backend, NTL_ZZ_pX, NTL_ZZ_pEX) using good multiplication algorithms. If > you're interested in helping, comment on the ticket or e-mail me. > > Finally, I'd like to plug #7716, which improves the sage-coverage script and > currently needs review. > David > > -- > To post to this group, send an email to sage-devel@googlegroups.com > To unsubscribe from this group, send an email to > sage-devel+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/sage-devel > URL: http://www.sagemath.org > -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
