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Equation Icon  ∫ d4p 4 1 − ikκyκ f(x ) ⋆ g(x) = ----4d yf (x + -𝜃k)g (x + y )e (2π) ∫ 2 = ----1---- d4zd4yf (x + z)g(x + y)e−2izν𝜃−ν1κyκ. (166 ) π4 |det 𝜃|