SAGE
__init__(self, plist, morder)
__add__(self, other)
__getitem__(self, key)
__len__(self)
__mul__(self, other)
__or__(self, other)
__repr__(self)
__str__(self)
add_polylists(left, right, monord)
concat(self, value)
dirac_delta(i, j)
intersect(self, other)
mult_polylists(left, right, monord)
standard_basis_vector(a, i, n)
union(self, other)