Pith Number

pith:WFJBRBBG

pith:2012:WFJBRBBGN76FOV6XAU5GYRXFYA

not attested not anchored not stored refs pending

The black-and-white coloring problem on circle graphs

Sheung-Hung Poon, Ton Kloks, Yue-Li Wang

arxiv:1202.1896 v2 · 2012-02-09 · 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{WFJBRBBGN76FOV6XAU5GYRXFYA}

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	2026-05-18T03:59:49.020824Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b1521884266ffc5757d7053a6c46e5c03e9dbe9af52d85d2bbfd9cf132924408

Aliases

arxiv: 1202.1896 · arxiv_version: 1202.1896v2 · doi: 10.48550/arxiv.1202.1896 · pith_short_12: WFJBRBBGN76F · pith_short_16: WFJBRBBGN76FOV6X · pith_short_8: WFJBRBBG

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/WFJBRBBGN76FOV6XAU5GYRXFYA \
  | 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: b1521884266ffc5757d7053a6c46e5c03e9dbe9af52d85d2bbfd9cf132924408

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5b6540308f8730e5d968aa03f0a16018d84c404d6453177996bd63dba94edd4a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DM",
    "submitted_at": "2012-02-09T06:36:08Z",
    "title_canon_sha256": "b3f0d992b78db43e2e9caa196c5fde17f6e674ae94621890a032e3bd1e1125e5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1202.1896",
    "kind": "arxiv",
    "version": 2
  }
}