Hi,
I thought the idiom to define a map is:
from sage.categories.map import Map
from sage.categories.homset import Hom
from sage.categories.fields import Fields
class Derivation(Map):
def __init__(self, field):
Map.__init__(self, Hom(field, field, Fields()))
But then the last two tests fail:
d = Derivation(GF(2))
d._test_category()
d._test_pickling()
What did I do wrong? Or what should I do more?
Thank you for attention in advance.
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