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def definition def or abbrev

hypothesis5

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formal statement (Lean)

 120noncomputable def hypothesis5 : ℝ := Real.sin (Real.pi / (4 * phi))

proof body

Definition body.

 121
 122/-- Hypothesis 6: λ = (φ - 1)^2 / φ
 123
 124    0.618² / 1.618 = 0.382 / 1.618 = 0.236
 125
 126    Close! Only 4% off from observed 0.227. -/

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