D n a = π π m a + π π ¯ ¯ m ¯ ¯ a − − ( ε ε + ε ε ¯ ¯ ) n a , Δ Δ n a = ν ν m a + ν ν ¯ ¯ m ¯ ¯ a − − ( γ γ + γ γ ¯ ¯ ) n a , δ δ n a = μ μ m a + λ λ ¯ ¯ m ¯ ¯ a − − ( α α ¯ ¯ + β β ) n a , δ δ ¯ ¯ n a = λ λ m a + μ μ ¯ ¯ m ¯ ¯ a − − ( α α + β β ¯ ¯ ) n a ;