Equation Icon  [( )− 1( ) ] k ∂ Γ [¯f,σ,σ¯; ¯g] = 1-Tr Γ (2)+ ℛ^ k ∂ ^ℛ k k 2 k k f¯f¯ k k ¯f ¯f 1 [{ ( )−1 ( ) −1} ( ) ] − -Tr Γ (2k)+ ^ℛk − Γ (2k)+ ^ℛk k ∂k ^ℛk . (4.19) 2 ¯σσ σ¯σ ¯σσ