Pith Number

pith:XDXT2VQT

pith:2013:XDXT2VQTEOEEBRHX4UPKCQT74J

not attested not anchored not stored refs pending

Algorithms for perfectly contractile graphs

Fr\'ed\'eric Maffray, Nicolas Trotignon

arxiv:1309.0435 v1 · 2013-09-02 · cs.DM · math.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{XDXT2VQTEOEEBRHX4UPKCQT74J}

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	2026-05-18T03:14:27.309567Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b8ef3d5613238840c4f7e51ea1427fe24407979fb6dbeca39ede774ef4a3f393

Aliases

arxiv: 1309.0435 · arxiv_version: 1309.0435v1 · doi: 10.48550/arxiv.1309.0435 · pith_short_12: XDXT2VQTEOEE · pith_short_16: XDXT2VQTEOEEBRHX · pith_short_8: XDXT2VQT

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/XDXT2VQTEOEEBRHX4UPKCQT74J \
  | 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: b8ef3d5613238840c4f7e51ea1427fe24407979fb6dbeca39ede774ef4a3f393

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4d2fe1a081d0a087af2006cd3c6eb844941f8e0ac49fd48e08b4cb176af881e8",
    "cross_cats_sorted": [
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DM",
    "submitted_at": "2013-09-02T15:14:37Z",
    "title_canon_sha256": "aae0c05de013b2b4f422af0abb72861825887fff25cd00f4dd5b98479e54893a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1309.0435",
    "kind": "arxiv",
    "version": 1
  }
}