Oh, thanks. That seems to be just what I need. I should perhaps explain what I want to do: In my master's thesis I work to automate parts of the analysis of numerical methods through B-series. This fall I wrote some pure Python code to perform some of the more basic calculations. I had some Maple scipts wirtten by my supervisor to go by, and was also aware of some relevant functionality in Nodepy (by David Ketcheson). I implemented unordered, unlabeled rooted trees (based on multisets represented by a dictionary) and B-series (as python functions on the trees). This I used to find the order of an arbitrary B-series method, composition with hf(), the Lie derivative, and the modified equation.
My interest in using Sage was aroused when I found myself making half-hearted implementations of forests, linear combinations of trees, and so forth (I don't have a strong background in algebra, and simply made classes with the functionality I needed). Since you have done stuff much more closely related to B-seires than I originally thought, I can't help but wonder if you have also looked in to the Hopf-algebra of Connes and Kreimer? Or if you already have plans to do so? Regards, Henrik S. Sundklakk -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-combinat-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-combinat-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-combinat-devel. For more options, visit https://groups.google.com/d/optout.
