pith. machine review for the scientific record. sign in
theorem proved term proof

phi_inv3_lt

show as:
view Lean formalization →

No prose has been written for this declaration yet. The Lean source and graph data below render without it.

generate prose now

formal statement (Lean)

 427theorem phi_inv3_lt : goldenRatio⁻¹ ^ 3 < (0.237 : ℝ) := by

proof body

Term-mode proof.

 428  have h1 := phi_inv_lt
 429  have h2 := phi_inv2_lt
 430  have hpos : 0 < goldenRatio⁻¹ := inv_pos.mpr goldenRatio_pos
 431  nlinarith [sq_nonneg goldenRatio⁻¹]
 432
 433/-- Interval containing (φ⁻¹)³ - PROVEN -/

used by (2)

From the project-wide theorem graph. These declarations reference this one in their body.

depends on (4)

Lean names referenced from this declaration's body.