Abelian groups is second on my list (right after graphs + latex), but as I've been told, "many have failed here." So I'd get out of the way (or help) if anybody else is interested.
And I have a vested interest in permutation groups...... Rob On May 20, 1:18 pm, William Stein <wst...@gmail.com> wrote: > Let's rewrite: > > * abelian groups > * permutations groups > * piecewise functions > * Sage's riemann_roch_basis command (wrapping Brill-Noether)... > > William > > > > On Thu, May 20, 2010 at 12:58 PM, Dima Pasechnik <dimp...@gmail.com> wrote: > > Indeed, somehow people who wrote the permutation groups code in Sage > > kept forgetting that > > a permutation group is a pair (G,X), where G is a group and X is a > > set, on which G acts. > > Once you think that you can get away with permutations alone, you are > > doomed... > > (same would apply to any group actions, not only to permutation ones; > > e.g. if you have a linear group, don't even try to forget which > > vectorspace it operates on) > > > Sorry for sounding like a grumpy algebra professor :-) > > Dima > > > On May 20, 3:22 am, Dan Christensen <j...@uwo.ca> wrote: > >> Most of this discussion is about cases where sage thinks it is acting on > >> a bigger set than the user wants it to. I'll just point out bug 8963 > > >> http://trac.sagemath.org/sage_trac/ticket/8963 > > >> where sage has the reverse problem: it thinks that the set that is > >> being acted on is smaller. For example, it correctly computes that > >> the row stabilizer group of the tableau [[1,2],[3]] is a group with > >> two elements generated by the transposition (1,2), but it thinks that > >> this group is acting on the set {1, 2} rather than the set {1, 2, 3}, > >> and this leads to difficulties. > > >> That bug has a patch that fixes this particular problem, but enhancing > >> sage to know about the set that a permutation group acts on sounds like > >> a good idea. > > >> Dan > > >> -- > >> 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 > >> athttp://groups.google.com/group/sage-devel > >> URL:http://www.sagemath.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 > > athttp://groups.google.com/group/sage-devel > > URL:http://www.sagemath.org > > -- > William Stein > Professor of Mathematics > University of Washingtonhttp://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 athttp://groups.google.com/group/sage-devel > URL:http://www.sagemath.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
