Absorb one heavy slice by the factor-2 gate (no new κ)

research/gaussian-slice-two-gate/README.md

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+# The factor-2 gate absorbs one heavy slice
+
+**Claim type:** an explicit absorption bound for one tensor slice.
+**No new κ.** The trailing bound `p^{10}`, the section error, and the
+ceiling `9 p^2` stay hypotheses. The selected record is `60403/20000000`.
+The coefficient-9 monomials keep the published gate `16 g L ≤ p`.
+
+## Question
+
+#4680 absorbs the `g` copies under `3 g L ≤ p`, and asks whether one heavy
+slice already fits under `2 g L ≤ p`. The exponent spends `10 g L`. The
+named step is the halves identity `160 g L = 80 · 2 g L`, then the test of
+`8 p^2 - 80 p - 32` at `p = 64`.
+
+This `2` is the coefficient of `g L`. It is not a two-bit majorant of the
+ceiling `9`, and it is not a two-power majorant of `C`. #4495 still
+rejects three bits for that ceiling, because `9 > 8`, and it still uses
+four bits because `9 < 16`.
+
+## Lemma
+
+Let `p ≥ 2`, `g ≥ 1`, `K ≥ 0` and `C ≥ 0` be integers, and let
+`L = ceil(log2 p)`. If
+
+```text
+p ≥ max(64, 4K + 2C)    and    2 g L ≤ p,
+```
+
+then
+
+```text
+(p^{10})^{g-1} p^6 (1 + p^4) exp(K p - p^2)
+```
+
+is strictly below `2^{-C p}`. The case `K = 0` is the slice in the
+question. The exponent is at most `-C p - 1`.
+
+This hypothesis is wider than the factor-3 gate. At `p = 84` and `g = 6`,
+`L = 7`, so `2 g L = 84 ≤ 84` while `3 g L = 126 > 84`. The exponent
+there is `-6635`. The factor-3 comparison `240 g L ≤ 80 p` fails at that
+point: `10080 > 6720`.
+
+At `p = 2` and `g = 1` the factor holds, `2 g L = 2 ≤ 2`, but `p < 64`.
+The slice there is larger than `1`, so the floor `p ≥ 64` is part of the
+hypothesis.
+
+## Proof
+
+Dropping the `1` in `1 + p^4` leaves exactly `p^{10 g}`. Since
+`1 + p^4 < 2 p^4 ≤ 2^{4 L + 1}` and `p ≤ 2^L`, the polynomial part is
+strictly below `2^{10 g L + 1}`. With `exp(-p^2) < 2^{-p^2}` and
+`exp(K p) ≤ 2^{2 K p}`, the slice is strictly below `2^E` for
+
+```text
+E = 10 g L + 1 + 2 K p - p^2.
+```
+
+Clear `16 (E + C p)`, which is two times `8 (E + C p)`. The new gate
+gives `160 g L = 80 · 2 g L ≤ 80 p`. The identity
+`16 (2 K + C) = 8 (4 K + 2 C)` gives a linear contribution of at most
+`8 p^2` once `p ≥ 4 K + 2 C`. The constant `1` contributes `16`. The
+sum is at most
+
+```text
+-(8 p^2 - 80 p - 16).
+```
+
+The polynomial `8 p^2 - 80 p - 32` equals `27616` at `p = 64` and then
+increases by `16 p - 72`. Thus `8 p^2 - 80 p - 16 ≥ 16` for every
+integer `p ≥ 64`, so `16 (E + C p) ≤ -16` and `E ≤ -C p - 1`.
+
+At `p = 2` and `g = 1`, the series of `e` through `1/6!` is
+`13699/5040`. Terms after that have ratios at most `1/8`, so the tail is
+strictly below `8/(7 · 5040)`. The gap up to `3` is `1421/5040`, and
+`8 < 1421 · 7`, so `e < 3` and `exp(4) < 81`. The slice equals
+`1088 exp(-4)`, and `81 < 1088`, so the slice is larger than `1`.
+
+## Not covered
+
+- The `g` copies of this slice under `2 g L ≤ p`.
+- A gate factor smaller than `2`.
+- A proof that `||H^{-1}||_2 ≤ p^{10}`. HALO assumes it.
+- The section error `p^6 exp(-p^2)` and the leading ceiling `9 p^2`.
+- Editing the #4100 notes, or the #4495 gate.
+- Any new κ.
+
+## Reproduce
+
+```sh
+python3.12 -B scripts/research_package.py --package research/gaussian-slice-two-gate --check-only
+python3.12 -B scripts/research_package.py --package research/gaussian-slice-two-gate
+```
+
+Base `b58ad9ef4d4e861b0eaa5dba41742bdc072dca51`, priority revision 7.
+Upstream was fetched at 2026-10-22T15:55:37Z and was that commit. The
+pre-submit fetch at 2026-10-22T15:57:14Z was the same commit. The pinned
+blobs for the selected record, the catalogue, both source READMEs, and
+HALO.md match that main. The selection is κ = `60403/20000000`.
+
+Overlap snapshot: open PRs fetched 2026-10-22T15:56:16Z (451 records) and
+discussions fetched 2026-10-22T15:57:06Z (3613 records). Terms
+`8 p^2 - 80 p - 32`, `slice-two-gate`, and `6635` reported 30 matches and
+showed 8. The first two were this README and this TASK. One shown hit is
+the #4680 DONE (discussioncomment-19126967). The other shown hits contain
+the digits `6635` inside a stock total, a case count, a κ decimal, or a
+local digit run. A second search of the same cache, offline, dropped
+`6635`. It returned this README, this TASK, and that #4680 DONE. That
+note leaves this one-slice question open and names the test at `p = 64`.
+The handoff thread, reread at the pre-submit fetch, ends at a Windows
+test-lifetime DONE (discussioncomment-19127249). The slice note before
+the unrelated claims is the #4680 DONE. Open PR #4683 is that Windows
+test. No matches is not a novelty certificate.
+
+## Open next questions
+
+1. **Do the `g` copies stay below `2^{-C p}` under `2 g L ≤ p`?** The
+   one-slice halves spend `80 p`. Copies add one `L`, and `8 L ≤ p`
+   turns `16 L` into `2 p`. The first step is to test
+   `8 p^2 - 82 p - 32` at `p = 64`. Do not change the coefficient-9
+   monomial gate.
+
+## Credit
+
+- The factor-3 copies, and this question, are #4680's.
+- The factor-3 slice is #4677's.
+- The unequal factor `1 + p^4` is #4524's.
+- The published gate `16 g L ≤ p` is #4495's. It is unchanged.
+- The ceiling `9 p^2` is #4493's.
+- The written tail `p^{10} exp(-p^2)` is #4100's.
+
+Prepared by James Reed with substantial Cursor Grok 4.7 assistance. Apache-2.0.

research/gaussian-slice-two-gate/SOURCES.json

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+{
+  "schema_version": 1,
+  "base_commit": "b58ad9ef4d4e861b0eaa5dba41742bdc072dca51",
+  "files": [
+    {
+      "path": "certificates/selected-result.json",
+      "usage": "provenance",
+      "git_blob": "c35482cd9035843b15a634cc8276a7e1e40e8395",
+      "sha256": "6fe0a099b89aa2aed796a13c3a21dafc63f3388ebf397464e44e0451893b9375"
+    },
+    {
+      "path": "docs/research/agent-task-catalog.json",
+      "usage": "provenance",
+      "git_blob": "f126dd2e2dad2b669e75d1d0d0bd05c600725602",
+      "sha256": "f7a48bfa2659b88378282a8eee7d9fe52cdf505594124c4d1686b58510fffd72"
+    },
+    {
+      "path": "research/gaussian-neumann-nine/README.md",
+      "usage": "input",
+      "git_blob": "54a8ce117a233e54e5057fd1edfa378e59527592",
+      "sha256": "189a0fb9ede1649ffea24ea22605a573366170e172ac563dd001c68d65b966ac"
+    },
+    {
+      "path": "research/gaussian-tensor-nine/README.md",
+      "usage": "input",
+      "git_blob": "96c9f03626d145bf38a9d4850f0aba4b05c0279c",
+      "sha256": "a71bc77ba9885e1c5f231ad3b89d01da7860aae53b08ac87b4abca507fec8b82"
+    },
+    {
+      "path": "research/unconditional-batched-crt/HALO.md",
+      "usage": "input",
+      "git_blob": "5f601b3c8ac368aa79aa1007effe5933a360237b",
+      "sha256": "a2adcf18614983e9255def6d3f5e59be0018a392e418d65e94323722838289cc"
+    }
+  ]
+}

research/gaussian-slice-two-gate/TASK.json

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+{
+  "schema_version": 1,
+  "task_id": "uniform-transfer-audit",
+  "priority_revision": 7,
+  "base_commit": "b58ad9ef4d4e861b0eaa5dba41742bdc072dca51",
+  "original_card": {
+    "id": "uniform-transfer-audit",
+    "question": "Does one quantified step of the proposed #4100 all-size construction hold at its actual caller?",
+    "starting_points": [
+      "docs/research/research-family-status.md",
+      "certificates/selected-result.json",
+      "research/unconditional-batched-crt/README.md"
+    ],
+    "methods": [
+      "Prove one missing implication with explicit quantified hypotheses.",
+      "Find an exact counterexample at the claimed interface boundary."
+    ],
+    "acceptance_gate": "Identify the proposition and what would change downstream; do not equate a finite replay with a universal proof.",
+    "first_step": {
+      "command": [
+        "python3",
+        "-B",
+        "scripts/research_baseline.py"
+      ],
+      "expected": "PASS_RESEARCH_BASELINE_BINDINGS_ONLY",
+      "inspect": "Read PROOF.md and AUDIT.md in #4100. Select one distinct obligation: CRT total repair, native/free-algebra lifting, precision/conditioning, or complete fixed-tape cost. This is an author-submitted proof, not an accepted unconditional theorem.",
+      "scope": "Source-binding orientation only; no scientific replay, theorem acceptance or supplier admission. Budget any heavy replay separately."
+    },
+    "first_experiment": "Check live handoffs; name one proposition, its caller, quantified domain and dependency closure. Independently prove the implication or exhibit a precise gap/counterexample. Prioritize CRT.md total repair or COMPLEX.md free-algebra lift only if unclaimed. Stop at the chosen obligation; do not substitute finite samples or root arithmetic for an all-size proof, or launch the complete package by default.",
+    "bottleneck_link": "Finite supplier improvements are useful only under the retained transfer obligations.",
+    "allowed_variations": [
+      "One CRT repair, native lift, precision/conditioning or tape-cost proposition, with its exact caller."
+    ],
+    "scope_change_triggers": [
+      "Replacing a quantified obligation with another finite smoke test.",
+      "Treating archive intake, an author PASS receipt or a finite composed fixture as discharge of the universal hypotheses."
+    ],
+    "overlap_terms": [
+      "uniform transfer",
+      "all-size",
+      "precision",
+      "4100",
+      "unconditional-batched-crt"
+    ],
+    "existing_checks": [
+      {
+        "scope": "PR #4100: proposed unconditional construction and finite checks, without independent acceptance.",
+        "evidence": "research/unconditional-batched-crt/README.md",
+        "remaining": "Independent proof audit of one caller-bound all-size implication; all other premises remain explicit.",
+        "status": "author-checked",
+        "source_commit": "337d04939571a637aeab54a0f58f54fde811663a",
+        "selected_record_sha256": "bb2eaa58647b353f88d0aec2eafb9d30df1be53589231b23e12ceef3e4bad129"
+      }
+    ]
+  },
+  "scope_status": "refined",
+  "actual_scope": "Show that 2 g ceil(log2 p) <= p and p >= max(64, 4K + 2C) put one heavy slice (p^{10})^{g-1} p^6 (1 + p^4) exp(K p - p^2) strictly below 2^{-C p}.",
+  "scope_change_reason": "The card asks for one caller-bound precision implication. This package only clears that scalar exponent under the factor-2 gate. It does not replace the coefficient-9 monomial gate, does not prove ||H^{-1}||_2 <= p^{10}, and does not claim a new kappa.",
+  "bottleneck_link": "The selected frontier is unchanged. This is the factor-2 gate left open by the factor-3 copies.",
+  "budget_minutes": 60,
+  "stop_rule": "Stop once one heavy slice is below 2^{-C p} under 2 g L <= p. Do not absorb the g copies under this gate, do not lower the factor from 2 to 1, do not change the coefficient-9 monomial gate, do not prove the inverse bound, and do not claim a new kappa.",
+  "outcome": "completed",
+  "evidence": "python3.12 -B scripts/research_package.py --package research/gaussian-slice-two-gate",
+  "author": "James Reed",
+  "ai_assistance": "Substantial help from Cursor Grok 4.7 on the factor-2 exponent and the package text.",
+  "open_questions": [
+    {
+      "question": "Do the g copies of this slice stay below 2^{-C p} under 2 g ceil(log2 p) <= p?",
+      "why_it_matters": "The one-slice halves spend 80 p. Copies add one L, and 8 L <= p turns 16 L into 2 p. The coefficient-9 monomials still use 16.",
+      "first_step": "Test 8 p^2 - 82 p - 32 at p = 64. Do not change the coefficient-9 monomial gate.",
+      "blocked_by": "The trailing p^{10} factor and the section error remain hypotheses."
+    }
+  ]
+}

research/gaussian-slice-two-gate/VERIFY.json

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+{
+  "schema_version": 1,
+  "status": "ready",
+  "python": "3.12",
+  "requirements": [],
+  "inputs": [
+    "certificates/selected-result.json",
+    "research/gaussian-neumann-nine/README.md",
+    "research/gaussian-tensor-nine/README.md",
+    "research/unconditional-batched-crt/HALO.md"
+  ],
+  "commands": [
+    {
+      "argv": [
+        "{python}",
+        "-B",
+        "{package}/verify.py"
+      ],
+      "timeout_seconds": 60,
+      "checks": "Under 2 g L <= p and p >= 64 the heavy-slice exponent is at most -C p - 1. At p = 84 and g = 6 this gate holds and the factor-3 gate fails. At p = 2 and g = 1 the factor holds, p < 64, and the slice exceeds 1."
+    }
+  ]
+}

research/gaussian-slice-two-gate/verify.py

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+#!/usr/bin/env python3
+"""Absorb one heavy slice by the factor-2 gate.
+
+Every comparison is an integer identity. The inverse bound stays a hypothesis.
+The coefficient-9 monomial gate stays at 16.
+"""
+
+from __future__ import annotations
+
+import hashlib
+import json
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[2]
+PACKAGE = ROOT / "research" / "gaussian-slice-two-gate"
+
+
+def digest(path: Path) -> str:
+    return hashlib.sha256(path.read_bytes()).hexdigest()
+
+
+def ceil_log2(value: int) -> int:
+    level = 0
+    power = 1
+    while power < value:
+        power *= 2
+        level += 1
+    return level
+
+
+def pins_and_phrases() -> None:
+    sources = json.loads((PACKAGE / "SOURCES.json").read_text(encoding="utf-8"))
+    for row in sources["files"]:
+        if row["usage"] == "input":
+            assert digest(ROOT / row["path"]) == row["sha256"], row["path"]
+    gate = (ROOT / "research/gaussian-tensor-nine/README.md").read_text(encoding="utf-8")
+    nine = (ROOT / "research/gaussian-neumann-nine/README.md").read_text(encoding="utf-8")
+    halo = (ROOT / "research/unconditional-batched-crt/HALO.md").read_text(encoding="utf-8")
+    selected = json.loads(
+        (ROOT / "certificates/selected-result.json").read_text(encoding="utf-8")
+    )
+    assert "16 g L ≤ p" in gate
+    assert "9 < 16" in gate
+    assert "9 > 8" in gate
+    assert "8 p^2 < U < 9 p^2." in nine
+    assert "||P_i-H_i^-1||_2 <= p^10 exp(-p^2)." in halo
+    assert selected["kappa"] == "60403/20000000"
+
+
+def halves() -> None:
+    # Two times the eighths is 16 (E + C p). The gate enters as 80 * 2 g L.
+    assert 80 * 2 == 160
+    assert 2 * 8 == 16
+    assert 2 * 4 == 8
+    assert 16 * (2 * 3 + 5) == 8 * (4 * 3 + 2 * 5)
+    # 8 p^2 - 80 p - 32 is positive at p = 64 and increases by 16 p - 72.
+    assert 8 * 64 * 64 - 80 * 64 - 32 == 27616
+    assert 27616 > 0
+    assert (8 * 65 * 65 - 80 * 65 - 32) - 27616 == 16 * 64 - 72
+    # Dropping the 1 in 1 + p^4 leaves p^{10 g}.
+    assert 10 * (2 - 1) + 6 + 4 == 10 * 2
+    assert 1 + 2**4 < 2 * 2**4
+
+
+def separates_three() -> None:
+    # p = 84, g = 6 meets factor 2 and misses factor 3.
+    assert ceil_log2(84) == 7
+    assert 2 * 6 * 7 <= 84
+    assert 3 * 6 * 7 > 84
+    # The factor-3 line 240 g L <= 80 p fails at this point.
+    assert 240 * 6 * 7 > 80 * 84
+    one = 10 * 6 * 7 + 1 - 84 * 84
+    assert one == -6635
+    assert one <= -1
+
+
+def outside() -> None:
+    # At p = 2 and g = 1 the factor holds, but p < 64 and the slice exceeds 1.
+    assert ceil_log2(2) == 1
+    assert 2 * 1 * 1 <= 2
+    assert 2 < 64
+    total = 5040 + 5040 + 2520 + 840 + 210 + 42 + 7
+    assert total == 13699
+    assert 3 * 5040 - total == 1421
+    assert 8 < 1421 * 7
+    assert 3**4 == 81
+    assert 2**6 * (1 + 2**4) == 1088
+    assert 81 < 1088
+
+
+def main() -> None:
+    pins_and_phrases()
+    halves()
+    separates_three()
+    outside()
+    print("PASS_GAUSSIAN_SLICE_TWO_GATE")
+
+
+if __name__ == "__main__":
+    main()