Pith Number

pith:PAMQ5W5Z

pith:2011:PAMQ5W5ZHN636WW5GDSJGHNNCX

not attested not anchored not stored refs pending

Complexity of Interlocking Polyominoes

Sidharth Dhawan, Zachary Abel

arxiv:1112.4087 v1 · 2011-12-17 · 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{PAMQ5W5ZHN636WW5GDSJGHNNCX}

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	2026-05-18T04:06:07.041844Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

78190edbb93b7dbf5add30e4931dad15c3270bb490a7c21270ba716db0cc8356

Aliases

arxiv: 1112.4087 · arxiv_version: 1112.4087v1 · doi: 10.48550/arxiv.1112.4087 · pith_short_12: PAMQ5W5ZHN63 · pith_short_16: PAMQ5W5ZHN636WW5 · pith_short_8: PAMQ5W5Z

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/PAMQ5W5ZHN636WW5GDSJGHNNCX \
  | 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: 78190edbb93b7dbf5add30e4931dad15c3270bb490a7c21270ba716db0cc8356

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "091b646f4029ace93f628443242c88a767fd1595363922b2a489d315b98c8852",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2011-12-17T21:11:52Z",
    "title_canon_sha256": "7d5594afa4ec48bc2b62747811fd6bad790d815d5a2f54cea152ec3ef2a445e1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1112.4087",
    "kind": "arxiv",
    "version": 1
  }
}