r"""
The class for elements that both belong to a subalgebra and
have a Cartesian product algebra as their parent. By inheriting
:class:`CartesianProductParentEJAElement` in addition to
r"""
The class for elements that both belong to a subalgebra and
have a Cartesian product algebra as their parent. By inheriting
:class:`CartesianProductParentEJAElement` in addition to