I would like to create a new category that's derived from
AlgebrasWithBasis, but I get an infinite recursion when I ask for the
CartesianProducts:
Here's a simple example:
class MyAlgebrasWithBasis(AlgebrasWithBasis):
def __init__(self,R):
AlgebrasWithBasis.__init__(self,R)
Now this works:
print AlgebrasWithBasis(GF(5)).CartesianProducts
<bound method AlgebrasWithBasis.CartesianProducts of Category of
algebras with basis over Finite Field of size 5>
but this doesn't:
print MyAlgebrasWithBasis(GF(5)).CartesianProducts
RuntimeError: maximum recursion depth exceeded
Curiously, it works for the DualObjects:
print MyAlgebrasWithBasis(GF(5)).DualObjects
<bound method MyAlgebrasWithBasis.DualObjects of Category of my
algebras with basis over Finite Field of size 5>
I think this is a problem with CovariantConstructionCategory.__classget__
but I have no idea how to fix this. (I'm using Sage 4.7.rc1 here.) Is
there a workaround I could use?
Cheers,
Christian
--
http://www.nullhomotopie.de
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