Pith Number

pith:QE5MHFCF

pith:2014:QE5MHFCF4HGSPYQ433UJONWGC3

not attested not anchored not stored refs pending

On the Complexity of Role Colouring Planar Graphs, Trees and Cographs

Christopher Purcell, M. Puck Rombach

arxiv:1408.5412 v1 · 2014-08-14 · cs.DS · cs.CC · cs.DM

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QE5MHFCF4HGSPYQ433UJONWGC3}

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	2026-05-18T02:44:25.232304Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

813ac39445e1cd27e21cdee89736c616c2f46d4f3a106a16470bc233ca11a00c

Aliases

arxiv: 1408.5412 · arxiv_version: 1408.5412v1 · doi: 10.48550/arxiv.1408.5412 · pith_short_12: QE5MHFCF4HGS · pith_short_16: QE5MHFCF4HGSPYQ4 · pith_short_8: QE5MHFCF

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/QE5MHFCF4HGSPYQ433UJONWGC3 \
  | 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: 813ac39445e1cd27e21cdee89736c616c2f46d4f3a106a16470bc233ca11a00c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3fe7ebb0346814611c49ff4bdd50428157de157c9a6eb30ecf7aa17eb1fe7f67",
    "cross_cats_sorted": [
      "cs.CC",
      "cs.DM"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2014-08-14T16:33:49Z",
    "title_canon_sha256": "2a92ee9d475e095095009174efa0cdf11f42b644b2dba0ac4e191d3b98c85b91"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1408.5412",
    "kind": "arxiv",
    "version": 1
  }
}