I believe I understood now:
sage: ?parent
Type: function
<snip>
Return x.parent() if defined, or type(x) if not.
I wonder why this is a function, and not a method of Parent? (Am I right that
all Sage parents inherit from Parent? Would be great to know this)
Set_object inherits from Set_generic, and does not define a parent method, for
whatever reason, maybe because the elements of the set need not have a common
type.
I just saw on
http://trac.sagemath.org/sage_trac/attachment/ticket/2314/coerce_2_sets.patch
a patch to primes.py, which, in particular, makes Primes inherit from a new
class Subset instead of Set_generic. I guess this adresses the issue.
It would be wonderful to hear either of "yes, correct", or "no, you are
mistaken".
Many thanks,
Martin
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to sage-support@googlegroups.com
To unsubscribe from this group, send email to [EMAIL PROTECTED]
For more options, visit this group at
http://groups.google.com/group/sage-support
URLs: http://www.sagemath.org
-~----------~----~----~----~------~----~------~--~---
