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def definition def or abbrev

probability

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formal statement (Lean)

  60noncomputable def probability {n : ℕ} (S : SMatrix n) (i j : Fin n) : ℝ :=

proof body

Definition body.

  61  ‖amplitude S i j‖^2
  62
  63/-! ## Unitarity and Probability Conservation -/
  64
  65/-- **THEOREM (Unitarity Inverse)**: S is invertible with S⁻¹ = S†.
  66    This is the other direction of unitarity.
  67
  68    For finite-dimensional spaces, S†S = I implies SS† = I.
  69    This is a standard result in linear algebra. -/

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