Pith Number

pith:XTZFH2EP

pith:2018:XTZFH2EPZ4EFGNLGFJCUJLSVDH

not attested not anchored not stored refs pending

Role colouring graphs in hereditary classes

Christopher Purcell, Puck Rombach

arxiv:1802.10180 v1 · 2018-02-27 · cs.CC · 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{XTZFH2EPZ4EFGNLGFJCUJLSVDH}

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	2026-05-18T00:22:17.898574Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bcf253e88fcf085335662a4544ae5519e7056f5529d0466f2fceb15ed81cd121

Aliases

arxiv: 1802.10180 · arxiv_version: 1802.10180v1 · doi: 10.48550/arxiv.1802.10180 · pith_short_12: XTZFH2EPZ4EF · pith_short_16: XTZFH2EPZ4EFGNLG · pith_short_8: XTZFH2EP

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/XTZFH2EPZ4EFGNLGFJCUJLSVDH \
  | 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: bcf253e88fcf085335662a4544ae5519e7056f5529d0466f2fceb15ed81cd121

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "00dfc39a2386e73a7505e7d8844ca68b0207027ea3c67ab3fd5c62775b8bf829",
    "cross_cats_sorted": [
      "math.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2018-02-27T21:58:18Z",
    "title_canon_sha256": "4b2a310b1c575023068bb7962efb8437ef4f63ebf417055d946463f9f812b42b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1802.10180",
    "kind": "arxiv",
    "version": 1
  }
}