Pith Number

pith:7IVNDKGU

pith:2013:7IVNDKGUSHF6UVCATDZQW7GCVM

not attested not anchored not stored refs pending

Strong edge coloring of planar graphs

Borut Lu\v{z}ar, D\'avid Hud\'ak, Riste \v{S}krekovski, Roman Sot\'ak

arxiv:1303.4580 v2 · 2013-03-19 · 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{7IVNDKGUSHF6UVCATDZQW7GCVM}

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.

Cited by

1 paper in Pith

Coloring, List Coloring, and Painting Squares of Graphs (and other related problems)

Receipt and verification

First computed	2026-05-18T02:58:23.627518Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fa2ad1a8d491cbea544098f30b7cc2ab23832ab9f047e999b14732aa478da6c5

Aliases

arxiv: 1303.4580 · arxiv_version: 1303.4580v2 · doi: 10.48550/arxiv.1303.4580 · pith_short_12: 7IVNDKGUSHF6 · pith_short_16: 7IVNDKGUSHF6UVCA · pith_short_8: 7IVNDKGU

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/7IVNDKGUSHF6UVCATDZQW7GCVM \
  | 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: fa2ad1a8d491cbea544098f30b7cc2ab23832ab9f047e999b14732aa478da6c5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ae04b0c38267b9b81737a8eac1cb2efb27caa4f30f76c4ad4d9d80415de243f4",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2013-03-19T13:11:27Z",
    "title_canon_sha256": "3946446a487e4026c405081374cef88688903944cf58f7df51664a132f1ce12e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1303.4580",
    "kind": "arxiv",
    "version": 2
  }
}