Pith Number

pith:JKR3UINA

pith:2019:JKR3UINAOHQL5DXOCKB4O2C4RY

not attested not anchored not stored refs pending

Queens in exile: non-attacking queens on infinite chess boards

F. Michel Dekking, Jeffrey Shallit, N. J. A. Sloane

arxiv:1907.09120 v2 · 2019-07-22 · 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{JKR3UINAOHQL5DXOCKB4O2C4RY}

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	2026-05-17T23:39:23.562715Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4aa3ba21a071e0be8eee1283c7685c8e2b26efa0c6ed8045949e41cec522864d

Aliases

arxiv: 1907.09120 · arxiv_version: 1907.09120v2 · doi: 10.48550/arxiv.1907.09120 · pith_short_12: JKR3UINAOHQL · pith_short_16: JKR3UINAOHQL5DXO · pith_short_8: JKR3UINA

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/JKR3UINAOHQL5DXOCKB4O2C4RY \
  | 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: 4aa3ba21a071e0be8eee1283c7685c8e2b26efa0c6ed8045949e41cec522864d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1ec3a71db8a732c4a2965105beb959873b646193a76bd3d24ce32823c5365f09",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2019-07-22T03:45:39Z",
    "title_canon_sha256": "9df5ea5501f170247fff171fc0af5f959adc558d03a66ecafc9fd7e6115156d1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1907.09120",
    "kind": "arxiv",
    "version": 2
  }
}