Pith Number

pith:7BD4GOGU

pith:2026:7BD4GOGU2UBN2JY2AE56TOXEWY

not attested not anchored not stored refs pending

Well-quasi-ordered classes of bounded clique-width

Aliaume Lopez, Ma\"el Dumas

arxiv:2601.18571 v2 · 2026-01-26 · math.CO · cs.FL · cs.LO

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7BD4GOGU2UBN2JY2AE56TOXEWY}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-28T02:04:45.489941Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f847c338d4d502dd271a013be9bae4b6090da9b5ee1362dd6fe11f63e59b2056

Aliases

arxiv: 2601.18571 · arxiv_version: 2601.18571v2 · doi: 10.48550/arxiv.2601.18571 · pith_short_12: 7BD4GOGU2UBN · pith_short_16: 7BD4GOGU2UBN2JY2 · pith_short_8: 7BD4GOGU

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/7BD4GOGU2UBN2JY2AE56TOXEWY \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: f847c338d4d502dd271a013be9bae4b6090da9b5ee1362dd6fe11f63e59b2056

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0fc7cf8ac6e3177ef5fa5672448627c706f39cbe0e8eeaade907084485dd64c9",
    "cross_cats_sorted": [
      "cs.FL",
      "cs.LO"
    ],
    "license": "http://creativecommons.org/licenses/by-sa/4.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2026-01-26T15:14:21Z",
    "title_canon_sha256": "da77fb51708b2b183960f741badbb1734bb75679ee2737eda4881da62bfa3e98"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2601.18571",
    "kind": "arxiv",
    "version": 2
  }
}