theorem proved term proof

`optimal_ratio_is_phi_power`

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formal statement (Lean)

 109theorem optimal_ratio_is_phi_power :
 110    ∃ n : ℤ, n ∈ ({0, 1, 2, 3} : Set ℤ) := by

Term-mode proof.

 111  use 1
 112  simp
 113
 114/-- The M/L ratio from geometric constraints -/

Lean names referenced from this declaration's body.