FiniteDimensionalEJA.CartesianProduct = CartesianProductEJA
random_eja = ConcreteEJA.random_instance
-#def random_eja(*args, **kwargs):
-# from sage.categories.cartesian_product import cartesian_product
-# J1 = HadamardEJA(1, **kwargs)
-# J2 = RealSymmetricEJA(2, **kwargs)
-# J = cartesian_product([J1,J2])
-# return J