Equation Icon  1 ∮ 1 ∮ ′ ′ H 𝒮 [λ, ¯μ] :=----- u(λ, ¯μ)ab = −----- ¯γA B ¯μA′ΔB ′B λBd 𝒮, (7.14 ) 4πG 𝒮 4πG 𝒮