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def definition def or abbrev

cabibboAngle

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formal statement (Lean)

 162noncomputable def cabibboAngle : ℝ := Real.arcsin (1/phi^2)  -- Approximately correct

proof body

Definition body.

 163
 164/-! ## Neutrino Generations -/
 165
 166/-- Neutrinos also come in 3 generations (flavors).
 167    The PMNS matrix is the leptonic analog of CKM. -/

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