def __init__(self):
r"""
TESTS::
sage: NN = NonNegativeIntegerSemiring(); NN
Non negative integer semiring
sage: NN.category()
Join of Category of semirings and Category of commutative monoids and Category of infinite enumerated sets and Category of facade sets
sage: TestSuite(NN).run()
"""
NonNegativeIntegers.__init__(self, category=(Semirings().Commutative(), InfiniteEnumeratedSets()) )
def __init__(self):
r"""
TESTS::
sage: NN = NonNegativeIntegerSemiring(); NN
Non negative integer semiring
sage: NN.category()
Join of Category of semirings and Category of infinite enumerated sets and Category of facade sets
sage: TestSuite(NN).run()
"""
NonNegativeIntegers.__init__(self, category=(Semirings(), InfiniteEnumeratedSets()) )
