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def definition def or abbrev

measurementProbability

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formal statement (Lean)

 147noncomputable def measurementProbability {n : ℕ} (ψ : QuantumState n) (i : Fin n) : ℝ :=

proof body

Definition body.

 148  ‖ψ.amplitudes i‖^2
 149
 150/-- **THEOREM (Born Rule)**: Probabilities are non-negative. -/

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