theorem proved term proof

`cabibbo_value`

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formal statement (Lean)

  49theorem cabibbo_value : cabibboAngle > 0.22 ∧ cabibboAngle < 0.23 := by

Term-mode proof.

  50  unfold cabibboAngle
  51  constructor <;> norm_num
  52
  53/-- The Wolfenstein parameter λ = sin(θ_c) ≈ 0.227. -/

Lean names referenced from this declaration's body.