+ [0 0 0]
+ [0 0 0]
+ [0 0 0]
+
+ ::
+
+ sage: J = RealSymmetricEJA(2)
+ sage: x = J.linear_combination(zip(range(len(J.gens())), J.gens()))
+ sage: x.operator()
+ Morphism from Euclidean Jordan algebra of degree 3 over Rational
+ Field to Euclidean Jordan algebra of degree 3 over Rational Field
+ given by matrix
+ [ 0 1 0]
+ [1/2 1 1/2]
+ [ 0 1 2]
+ sage: 2*x.operator()
+ Morphism from Euclidean Jordan algebra of degree 3 over Rational
+ Field to Euclidean Jordan algebra of degree 3 over Rational Field
+ given by matrix
+ [0 2 0]
+ [1 2 1]
+ [0 2 4]
+ sage: x.operator()*2
+ Morphism from Euclidean Jordan algebra of degree 3 over Rational
+ Field to Euclidean Jordan algebra of degree 3 over Rational Field
+ given by matrix
+ [0 2 0]
+ [1 2 1]
+ [0 2 4]