Hi Simon, >> The implementation of FreeSmallCategory in #12630 is somewhat related >> to what I need. I do not understand why the FreeSmallCategory can be a >> Magma ? The composition is not defined everywhere... > > Multiplication of paths *is* defined everywhere. That's why the > FreeSmallCategory > of #12630 contains an element called "invalid path".
I see. Thanks. Did you discuss the pros and cons of - adding an extra element NotAPath (your "invalid path") but having a multiplication defined everywhere - having a partial multiplication I do not like the extra element in my case because in all algorithm I will need to check that (recall that I want morphisms from the set of paths to other set of paths). >> In my case, I >> want it to be a groupoid because I do have inversion, but in your case >> you don't and it looks like a monoidoid (?) > > There has been a decision on the name on a different thread on > sage-combinat-devel, and I wouldn't like to change it again. Sure. I was not discussing the name but the category here. I guess that your FreeSmallCategory has some special features dedicated to Quiver and it has no meaning to change it. Nevertheless, it is still possible to factorize code. Best, Vincent -- 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/groups/opt_out.
