Equation Icon  ∫ ∂2ϕ − △ ϕ = − e4ϕ ∘--𝔣dp---, (22 ) t x ℝ3 1 + |p|2 [ 2 −1∕2 ] ∂t𝔣 + p^⋅ ∇x 𝔣 − (∂tϕ + p^⋅ ∇x ϕ) p + (1 + |p| ) ∇x ϕ ⋅ ∇p 𝔣 = 0. (23 )