Content stub — prose, diagrams, and Lean 4 exercises to be written.
This week covers: Lean 4: Fibonacci type, φ as limit, convergence proof. Link to chPI-recurrence theorems.
Primary chapter references from book/: ch9-phi.html
-- dm³ 101 · Week 12 · Lean 4 Lab -- Operator: φ (≈ 1.618 Fibonacci) -- TODO: fill in theorems and exercises -- stub example : True := trivial