Equation Icon  α ′ α ′ H β′(x, x ) = V β′(x,x ), (15.32 ) α ′ 1- α ′ 1- α ′ G Sβ′(x, x ) = 2U β′(x,x )δ(σ) − 2V β′(x,x )𝜃(σ), (15.33 ) 1 [ ] [ 1 ] G Rαβ′(x, x′) = -U αβ′(x,x′) δ+(σ) − δ− (σ ) + V αβ′(x,x′) 𝜃+(− σ) +-𝜃(σ ) . (15.34 ) 2 2