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`BookProof.WeylCauchyRiemann.hasCompactSupport_comp_realProd` {F : ℂ → ℂ} (hF : HasCompactSupport F) : HasCompactSupport (fun p : ℝ × ℝ => F ((p.1 : ℂ) + p.2 * Complex.I)) · Prove2Me