phi_fifth_bounds

formal source

 113    
 114    φ⁵ = φ⁴ × φ, so with 6.7 < φ⁴ < 6.9 and 1.61 < φ < 1.62:
 115    10.7 < φ⁵ < 11.3 -/
 116theorem phi_fifth_bounds : (10.7 : ℝ) < (phi : ℝ)^(5 : ℕ) ∧ (phi : ℝ)^(5 : ℕ) < (11.3 : ℝ) := by
 117  have h1 : (phi : ℝ)^(5 : ℕ) = (phi : ℝ)^(4 : ℕ) * phi := by ring
 118  rw [h1]
 119  have h2 : (6.7 : ℝ) < (phi : ℝ)^(4 : ℕ) := phi_fourth_bounds.1
 120  have h3 : (phi : ℝ)^(4 : ℕ) < (6.9 : ℝ) := phi_fourth_bounds.2
 121  have h4 : phi > (1.61 : ℝ) := phi_gt_onePointSixOne
 122  have h5 : phi < (1.62 : ℝ) := phi_lt_onePointSixTwo
 123  constructor
 124  · nlinarith
 125  · nlinarith
 126
 127/-! ## Section: Certificate -/
 128
 129/-- **CERTIFICATE**: Cosmological predictions with calculated bounds.
 130    
 131    **EU-003**: 0.5 < n_s < 1 (spectral index from φ³)
 132    **T-001**: H₀ > 0 from ln(φ)
 133    **Phi powers**: φ², φ⁴, φ⁵ bounds for various predictions
 134    
 135    **All from φ with rigorous bounds.** -/
 136structure CosmologicalPredictionsCert where
 137  spectral_index_gt : (0.5 : ℝ) < 1 - 2 / (phi ^ 3)
 138  spectral_index_lt : 1 - 2 / (phi ^ 3) < 1
 139  hubble_pos : Real.log phi / 8 > 0
 140  phi_sq_lower : (2.59 : ℝ) < phi^2
 141  phi_sq_upper : phi^2 < (2.62 : ℝ)
 142  phi_fourth_lower : (6.7 : ℝ) < (phi : ℝ)^(4 : ℕ)
 143  phi_fourth_upper : (phi : ℝ)^(4 : ℕ) < (6.9 : ℝ)
 144  phi_fifth_lower : (10.7 : ℝ) < (phi : ℝ)^(5 : ℕ)
 145  phi_fifth_upper : (phi : ℝ)^(5 : ℕ) < (11.3 : ℝ)
 146