Pith Number

pith:SJR4HXDA

pith:2009:SJR4HXDAGGG43WCNT4DYWFL2QL

not attested not anchored not stored refs pending

A Planar Linear Arboricity Conjecture

Borut Luzar, Lukasz Kowalik, Marek Cygan

arxiv:0912.5528 v1 · 2009-12-30 · math.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{SJR4HXDAGGG43WCNT4DYWFL2QL}

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

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	2026-05-18T03:46:17.159094Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9263c3dc60318dcdd84d9f078b157a82dd9004809c675b774c24cd5fc928863a

Aliases

arxiv: 0912.5528 · arxiv_version: 0912.5528v1 · doi: 10.48550/arxiv.0912.5528 · pith_short_12: SJR4HXDAGGG4 · pith_short_16: SJR4HXDAGGG43WCN · pith_short_8: SJR4HXDA

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/SJR4HXDAGGG43WCNT4DYWFL2QL \
  | 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: 9263c3dc60318dcdd84d9f078b157a82dd9004809c675b774c24cd5fc928863a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "feeb38eb00bd94912aeb4a3c4177ec4a345778985152112bbcb9093ddc3b60b6",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2009-12-30T20:15:50Z",
    "title_canon_sha256": "4eb55e0ddd97df49ee5a3e9af3ef3b34f97a407202c06744c1de6e650e6f9ef5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0912.5528",
    "kind": "arxiv",
    "version": 1
  }
}