Pith Number

pith:PQY5JYW3

pith:2019:PQY5JYW3MOSK3ZZSQO4X45RYS5

not attested not anchored not stored refs pending

A note about online nonrepetitive coloring $k$-trees

Bal\'azs Keszegh, Xuding Zhu

arxiv:1909.02612 v1 · 2019-09-05 · 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{PQY5JYW3MOSK3ZZSQO4X45RYS5}

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	2026-07-05T00:02:41.085098Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7c31d4e2db63a4ade73283b97e7638977dc052902849c87bb28b2d5640517744

Aliases

arxiv: 1909.02612 · arxiv_version: 1909.02612v1 · doi: 10.48550/arxiv.1909.02612 · pith_short_12: PQY5JYW3MOSK · pith_short_16: PQY5JYW3MOSK3ZZS · pith_short_8: PQY5JYW3

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/PQY5JYW3MOSK3ZZSQO4X45RYS5 \
  | 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: 7c31d4e2db63a4ade73283b97e7638977dc052902849c87bb28b2d5640517744

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1eacecd6d09959c0af3f7486c1faefd548e9394723dcf5db3d2eab74de20a89d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2019-09-05T19:38:29Z",
    "title_canon_sha256": "c93df77c7b11a7bf1ac52710e13aabcc11bb735301b81e76b297886aa8ca3afb"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1909.02612",
    "kind": "arxiv",
    "version": 1
  }
}