Hello, The resources from sage days 20.5 may be helpful for this. See
http://wiki.sagemath.org/days20.5/schedule and in particular my May 5 talk: An introduction to categories and coercions in Sage The worksheet posted there should be reasonably self-contained; if not, there is apparently a video of my talk, though I haven't watched it, so can't vouch for the quality. As John said, please cross-post any followup questions to sage-combinat-devel where the relevant people are more likely to see your message. Hope this helps, Jason -- To post to this group, send an email to [email protected] To unsubscribe from this group, send an email to [email protected] For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
