dm³ 102 · Week 10 · Δ Operator

critDim(4) = 112 — The 1080-Proofs Connection

critDim(4) = 2*(56−1)+2 = 112, a real Lean-proved lemma (critDim_4). Correction: the sorry_inventory.csv audit file has 112 rows, but that counts distinct file/theorem entries, not sorrys — the actual sorry count there is 1,041 (1,027 still open). The 112/112 match is coincidental, not structural.

dm³ 102 · Week 10 · ≈ 1.927 Tetranacci

Course: dm³ 102 · Operator: Δ (≈ 1.927 Tetranacci) · Standard week

Content stub — prose, diagrams, and Lean 4 exercises to be written.

This week covers: critDim(4) = 2*(56−1)+2 = 112, a real Lean-proved lemma (critDim_4). Correction: the sorry_inventory.csv audit file has 112 rows, but that counts distinct file/theorem entries, not sorrys — the actual sorry count there is 1,041 (1,027 still open). The 112/112 match is coincidental, not structural.

Primary chapter references from book/: chDelta-tetranacci.html

-- dm³ 102 · Week 10 · Lean 4 Lab
-- Operator: Δ (≈ 1.927 Tetranacci)
-- TODO: fill in theorems and exercises

-- stub
example : True := trivial

← Week 9 ↑ dm³ 102 Course Week 11 →