Pith Number

pith:OPJQT5UX

pith:2015:OPJQT5UXWHVWGBD3F2X4F6DWBI

not attested not anchored not stored refs pending

A Ladder Tournament

Bertrand Tchantcho, Narcisse Tedjeugang, Roland Pongou

arxiv:1507.01327 v1 · 2015-07-06 · 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{OPJQT5UXWHVWGBD3F2X4F6DWBI}

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	2026-05-18T01:37:17.284589Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

73d309f697b1eb63047b2eafc2f8760a10dd4a86e0aed8a7d611014cd6e53436

Aliases

arxiv: 1507.01327 · arxiv_version: 1507.01327v1 · doi: 10.48550/arxiv.1507.01327 · pith_short_12: OPJQT5UXWHVW · pith_short_16: OPJQT5UXWHVWGBD3 · pith_short_8: OPJQT5UX

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/OPJQT5UXWHVWGBD3F2X4F6DWBI \
  | 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: 73d309f697b1eb63047b2eafc2f8760a10dd4a86e0aed8a7d611014cd6e53436

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d247b04c1e7a849e4b85a62eef4a38501236836f9dddab449bda16a5de4539d3",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2015-07-06T04:49:00Z",
    "title_canon_sha256": "004bf10a87947c1df7eda422d91dcb7dba5d8807265132cb9c524931bfcf07f3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1507.01327",
    "kind": "arxiv",
    "version": 1
  }
}