Equation Icon  ∮ ∮ ⟨¯ ⟩ 1- ¯ A ⟨ ¯ ⟩ -1 ¯ A Φ0 (t,s) = 𝒜 Φ0(t,s,θ ) d𝒜, Φa (t,s) = 𝒜 Φa (t,s,θ )d𝒜, (405 ) S(t,s) S(t,s)