For separable potential, say $x^4+y^4$, its symmetry are degenerate. Is that a generic case to every separable potential? I will explain my question:
The potential $x^4+y^4$ has $A_1, B_1, A_2, B_2, E$ symmetries. However, all of them are degenerate. Quantum mechanically, the energy level are all degenerate and one can consider, for example, only the $A_1$ symmetry, why?