Pith Number

pith:P7QDZU3H

pith:2019:P7QDZU3HOH3N7WTIXAYGIN7JP7

not attested not anchored not stored refs pending

Coloring squares of graphs with mad constraints

Herv\'e Hocquard, Seog-Jin Kim, Th\'eo Pierron

arxiv:1902.08135 v1 · 2019-02-21 · 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{P7QDZU3HOH3N7WTIXAYGIN7JP7}

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	2026-05-17T23:53:01.989270Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7fe03cd36771f6dfda68b8306437e97fee6cc17bf57288366c5b163594599132

Aliases

arxiv: 1902.08135 · arxiv_version: 1902.08135v1 · doi: 10.48550/arxiv.1902.08135 · pith_short_12: P7QDZU3HOH3N · pith_short_16: P7QDZU3HOH3N7WTI · pith_short_8: P7QDZU3H

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/P7QDZU3HOH3N7WTIXAYGIN7JP7 \
  | 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: 7fe03cd36771f6dfda68b8306437e97fee6cc17bf57288366c5b163594599132

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "636dc89357a55eda9101cf8bf1a4b4fcbc22bc9401e8839b4105592e99331163",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2019-02-21T16:47:36Z",
    "title_canon_sha256": "79a1721a6ec53f8ac5ec861043db74f1334525cf8df7c2550e0242d12273e181"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.08135",
    "kind": "arxiv",
    "version": 1
  }
}