e0 + e2
sage: e2*e2
e2
+
+ TESTS:
+
+ The degree of this algebra is `(n^2 + n) / 2`::
+
+ sage: set_random_seed()
+ sage: n = ZZ.random_element(1,5).abs()
+ sage: J = RealSymmetricSimpleEJA(n)
+ sage: J.degree() == (n^2 + n)/2
+ True
+
"""
S = _real_symmetric_basis(n, field=field)
Qs = _multiplication_table_from_matrix_basis(S)