On Sat, Feb 20, 2010 at 10:46:17AM -0800, Robert Bradshaw wrote: > On Feb 20, 2010, at 6:00 AM, Jason Grout wrote: > >> On 02/19/2010 12:45 PM, Robert Bradshaw wrote: >>> On Feb 19, 2010, at 8:30 AM, Ryan Hinton wrote: >>> >>>> Most classes in Sage have a .parent() method. I'm not a proper >>>> mathematician, so I'm not sure what it really means, but I use it for >>>> debugging occasionally. :-) >>> >>> Parents are objects in concrete categories, you can think of them as the >>> "sets" an object belongs to, and they store information specific to that >>> set and how they relate to other sets. >> >> There has been talk before of getting graphs into the coercion system, but >> apparently it hasn't been important enough to anyone to actually do. Do >> the combinat people have graphs of some sort in the coercion system? It >> seems that they have some sorts of graphs in their code. > > Typically graphs are viewed as objects in the category of graphs, right?
Or can have for parent the set of graph in the category set ? > What kind of coercions are people wanting? Florent -- 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
