T-108: Mixed rectangle-measure lower bound verified at , on a declared net
V3 C3 lower bound confirmed
A rectangle density of wand125/square-packing-bounds, checked at coverage one on a net it declares and published on 6 October 2026, proves = 5.81.
The certificate is a density of 505 uniform rectangles in D4 orbits, and no point mass, of total mass 2899999/100000, on the net T-096's certificate declares: core side 999/1000 and 416 half-angle tangents of step 1/1001. Since 999/1000 (1 + 1/1001) = 500499/500500 < 1, and the last tangent 415/1001 is past tan(pi/8), every unit square contains a concentric core at a net angle strictly in its interior.
The source reports every such core capturing mass at least one: at all 415 oblique net angles by code/mixed_rotated_verify.cpp, its research copy of Tokoharu's verify.cpp at coverage threshold one, run by the same driver as T-096's certificate, and at the axis by exact integer tables.
The value is above 2319/400 = 5.7975, the source's rectangle certificate rect_n29_L57975 and the reported (T-068) and verified (T-074) lower bound at before it, by 0.0125.
The certificate was decided here on 6 October 2026 by sqverify-fast, this repository's clean-room measure verifier, at all 416 directions of the net the candidate declares, and two mutants scaled below coverage one were refused: confirmed, independently re-implemented. The verifier shares no code with the source's checker and runs the same net-and-shrink method, so it is a second implementation and not a second method. The source's own checker was replayed here at nodes 0, 1, 364 and 415, the axis and the least-bound node among them, each returning the certificate's own record, and not in full: a partial reproduction with the producer's code.
wand125 after Tokoharu and Levy, square-packing-bounds. No registration was requested: an intake pass of the source found it. The source says parts of the work were produced with AI assistance under human direction.
Significance, composition and next rung
- Significance
- The strongest verified lower bound on record at , by 0.0125 above T-074, and the strongest reported. The certificate kind of T-099 on a declared net with the C++ checker of T-069 and later; no new technique, at S3 as T-096, T-099 and T-100 are.
- Composition
- One primary certificate on its reported entry and its replay entry. The replay is sqverify-fast at all 416 directions of the net the retained candidate declares: one interval-certified method, replayed here by an independent implementation, C3, on the census route. The source's checker was replayed at sampled directions and its axis tables at the axis only, so no second method and no complete reproduction with the producer's code stands beside it.
- Next rung
- V4 and C4 need two adversarial AI reviews of this result by distinct reviewers and a human oversight record; one is retained. A complete replay of the source's own checker, the bundle's driver over all 416 nodes (42 CPU-hours by the source's own seconds, about 30 at the sample's rate here), would add a reproduction with the producer's code beside the rung.
- Novelty
- previously-published Present in an identified source
The case
Proven
- numerical
Citation record n-029
lowerwand125 after Tokoharu, Levy et al. 2026, GitHub (confirmed T-108)
upperSchadt & Ellsworth, Squares in Squares (reported)
Open
- optimality
- exact value
The case record
Results on the case
13 results in the register on , oldest first, each with what it established and how it stands now.
2005 published T-007
for
V0 C1 lower bound incomplete on this case, superseded by T-108
Nagamochi · Nagamochi 2005 · source · register
2026-08-29 established T-009
, by a Krawczyk interval certificate
V3 C3 upper bound confirmed
Levy · register
2026-09-04 published T-085
Nagamochi 2005, Lemma 1 is false for every container with and
V3 C3 correction confirmed
Karakuş; chelokot · Karakuş 2026 · chelokot Nagamochi counterexample 2026 · packet · register
2026-09-22 published T-044
Weighted point lower bounds for ten counts in , plus seven from the same files
V3 C3 lower bound confirmed superseded by T-108
wand125 after Levy, Stromquist, Nagamochi, Burns, Massaccesi · wand125 point bounds 2026 · packet · source · review · register
2026-09-22 published T-047
; for ; for
V3 C3 lower bound confirmed superseded by T-108
Tokoharu after Levy, wand125, Stromquist, Nagamochi, Burns, Massaccesi · Tokoharu density 2026 · packet · source · review · register
2026-09-27 published T-046
Rectangle-density lower bounds reported for 48 counts in
V0 C0 lower bound recorded superseded by T-108
wand125 after Tokoharu, Levy, Stromquist, Nagamochi, Burns, Massaccesi · wand125 rectangle bounds 2026 · wand125 rectangle bounds 2026-09-28 · packet · packet · register
2026-09-28 published T-070
Rectangle-density lower bounds replayed at 25 counts in
V3 C3 lower bound confirmed superseded by T-108
wand125 after Tokoharu, Levy, Stromquist, Nagamochi, Burns, Massaccesi · wand125 rectangle bounds 2026-09-28 · packet · packet · source · review · register
2026-09-29 published T-058
Rectangle-certificate ceiling
α·UB(n)proved for ..100;B·UB(n)on 64 grid rowsV3 C3 method limit confirmed
wand125 after Tokoharu, Daniel · wand125 tools 2026 · packet · register
2026-09-29 published T-083
for every nonsquare
V3 C3 lower bound confirmed on this case, superseded by T-108
Karakuş · Karakuş 2026 · source · register
2026-10-01 published T-068
Rectangle-density lower bounds verified at 34 counts in
V3 C3 lower bound confirmed on this case, superseded by T-108
wand125 after Tokoharu, Levy, Stromquist, Nagamochi, Burns, Massaccesi · wand125 rectangle bounds 2026-10-01 · packet · source · review · register
2026-10-01 published T-074
Rectangle-density lower bounds replayed at 31 counts in
V3 C3 lower bound confirmed on this case, superseded by T-108
wand125 after Tokoharu, Levy, Stromquist, Nagamochi, Burns, Massaccesi · wand125 rectangle bounds 2026-10-01 · packet · packet · source · review · register
2026-10-06 published T-108 this result
Mixed rectangle-measure lower bound verified at , on a declared net
V3 C3 lower bound confirmed
wand125 after Tokoharu, Levy, Stromquist, Nagamochi, Burns, Massaccesi · wand125 mixed bounds check2 2026-10-06 · packet · source · review · register
2026-10-10 published T-132
Mixed rectangle-measure lower bound reported, on a 2,073-direction declared net
V0 C0 lower bound recorded
wand125 after Tokoharu and Levy · wand125 fine-net n29 2026-10-10 · packet · register
Links
- On this site
- Case record, · Frontier row, · T-108 in the results table
On GitHub, at main
- Register
- T-108 in
results.yaml, line 11126 - Evidence
E-n029-wand125-mixed-581-report·E-n029-wand125-mixed-581-sqverify-fast-replay- Proofs and certificates
- certificate
candidate.json.gz· proofSOUNDNESS.md· auditreview-2026-10-06-wand125-check2-ten-certificates.md - Sources
- wand125 mixed bounds check2 2026-10-06 (its own site, retained copy)
- Source packet
resources/web/wand125-mixed-bounds-check2-2026-10-06/README.md- Artifacts
14 artifacts and controls
resources/web/wand125-mixed-bounds-check2-2026-10-06/README.mdresources/web/wand125-mixed-bounds-check2-2026-10-06/receipts/n29-L581/audit.jsonresources/web/wand125-mixed-bounds-check2-2026-10-06/receipts/n29-L581/bundle.jsonresources/web/wand125-mixed-bounds-check2-2026-10-06/receipts/n29-L581/sample/nodes-000-415.jsondevtools/audit_wand125_declared_net.pysqverify_fast/SOUNDNESS.mdbenchmarks/measure-verifier/census-mixed/census.jsonbenchmarks/measure-verifier/census-mixed/wand125-mixed-bounds-check2-2026-10-06/mixed_n29_L581.jsonl.gzdevtools/sqverify_fast_census.pydocs/project/reviews/review-2026-10-06-wand125-check2-ten-certificates.mddocs/project/reviews/review-2026-10-06-sqverify-fast-declared-net-soundness.mdbenchmarks/measure-verifier/census-mixed/wand125-mixed-bounds-check2-2026-10-06/mixed_n29_L581.control.jsontests/test_sqverify_fast_census.pytests/test_audit_wand125_declared_net.py- Case file
frontier/n-029.md(verified lower, verified upper, reported lower, reported upper)