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def definition def or abbrev

hypothesis4

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formal statement (Lean)

  99noncomputable def hypothesis4 : ℝ := Real.sqrt (1 - 1/(phi^2 + 1))

proof body

Definition body.

 100
 101/-- Hypothesis 5: cos(θ_W) = √(1 - 1/(2φ + 1))
 102
 103    √(1 - 1/4.236) = √(1 - 0.236) = √0.764 ≈ 0.874
 104
 105    Very close to observed 0.881! -/

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