Thanks for all the answers. It seems my issues was caused by defining the _cmp_ method with the wrong number of underscores in my cython extension classes. Do you confirm that for parents defined in a usual Python class __cmp__ with two underscores should be used and for a cython extension class _cmp_ with only one underscore?
I've put back my original __hash__ functions which evaluate equal on the two different classes and have now nice polynomial rings as I wanted. Do you confirm this "hash collision" is not a problem? Thanx, JP -- 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.
