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def definition def or abbrev

amplitude

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formal statement (Lean)

  96noncomputable def amplitude (setup : DoubleSlitSetup) (y : ℝ) : ℂ :=

proof body

Definition body.

  97  let φ1 := pathPhase (pathLength1 setup y) setup.lambda
  98  let φ2 := pathPhase (pathLength2 setup y) setup.lambda
  99  Complex.exp (I * φ1) + Complex.exp (I * φ2)
 100
 101/-- The intensity (probability) at point y.
 102    I(y) = |A(y)|² = 2 + 2cos(Δφ) = 4cos²(Δφ/2) -/

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