I just saw Robert's ticket about implementing / wrapping braid groups in SAGE ( http://www.sagetrac.org/sage_trac/ticket/876 ) which is pretty coincidental since I was thinking about the exact same thing before I went to bed last night. I wrote an email to Nikos Apostolakis who had expressed interest in this on sage-support in June to see if he was still interested.
GAP3 had support for braid groups provided by the "share package" CHEVIE. Unfortunately, when the change to GAP4 was made, this was never ported over. As David Joyner mentioned, one possibility is to have a (optional) GAP3 package from which the functionality could be wrapped. Another possibility is to port the GAP3 chevie code over to GAP4. I do not know how much of an undertaking this would be because my familiarity with GAP programming is almost non-existent. The third possibility would be to port chevie directly over to SAGE; I looked at the code for chevie, and this is definitely doable. It would however take a bit of time -- it's about 6000 lines of GAP code and about 2000 lines of comments. It would be good to have a framework for root systems and the like that all of these things can fit into. This may be helpful in that aspect: http://mupad-combinat.sourceforge.net/Wiki/RootSystems --Mike --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~----------~----~----~----~------~----~------~--~---
