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`BookProof.ChapterCoherentPositionSpace.integral_exp_mul_exp` (a b : ℝ) : (∫ x : ℝ, Real.exp (-(x - a) ^ 2 / 2) * Real.exp (-(x - b) ^ 2 / 2)) = Real.exp (-(a - b) ^ 2 / 4) * Real. · Prove2Me