Content stub — prose, diagrams, and Lean 4 exercises to be written.
This week covers: Walk through no_return_to_critical: for n > 3, critDim(n) > 26. Proof by cases on n ≥ 4.
Primary chapter references from book/: chDelta-tetranacci.html
-- dm³ 102 · Week 12 · Lean 4 Lab -- Operator: Δ (≈ 1.927 Tetranacci) -- TODO: fill in theorems and exercises -- stub example : True := trivial