Hi, Le dimanche 8 novembre 2015 07:32:48 UTC+1, David Roe a écrit : > > > > I think Nils' point about the downsides of having a cache is one reason > not to use UniqueRepresentation, both because it can generate references to > objects you might want to forget, and because sometimes you just want to > start with two three dimensional manifolds, specifying distinct atlases as > you go. If you use unique representation, you might accidentally get the > same object. > > Why not just inherit from > :class:`~sage.misc.fast_methods.WithEqualityById` ? That seems to have > what you need. Yes, the standard pickling test will be broken, but I think > that's fine for your application. > David >
Yes, from the above discussions, I am convinced that this is the route to go: have manifolds and charts inherit from WithEqualityById, possibly adding a method is_isomorphic(), which could return True in a few easy cases, keeping in mind that most cases cannot be solved. Best wishes, Eric. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
