Pith Number

pith:PH5KZP23

pith:2015:PH5KZP23R3L3PCSEVEH6Y7LL5A

not attested not anchored not stored refs pending

The complexity of the Clar number problem and an FPT algorithm

Attila Bern\'ath, Erika R. B\'erczi-Kov\'acs

arxiv:1508.06889 v1 · 2015-08-27 · cs.DM · cs.CE

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PH5KZP23R3L3PCSEVEH6Y7LL5A}

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	2026-05-18T01:34:40.634610Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

79faacbf5b8ed7b78a44a90fec7d6be829c47ecf2f57fdcee4edc388e554eb18

Aliases

arxiv: 1508.06889 · arxiv_version: 1508.06889v1 · doi: 10.48550/arxiv.1508.06889 · pith_short_12: PH5KZP23R3L3 · pith_short_16: PH5KZP23R3L3PCSE · pith_short_8: PH5KZP23

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/PH5KZP23R3L3PCSEVEH6Y7LL5A \
  | 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: 79faacbf5b8ed7b78a44a90fec7d6be829c47ecf2f57fdcee4edc388e554eb18

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "83f47e09fc1008c7839721c4d417d3dca2c20a6e2daaecb2382bdf13b515fa7a",
    "cross_cats_sorted": [
      "cs.CE"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DM",
    "submitted_at": "2015-08-27T15:00:19Z",
    "title_canon_sha256": "5f25a271c3fca53cb35acf1a36c7d208671f67c47ed051f73e4054f9a2f61931"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1508.06889",
    "kind": "arxiv",
    "version": 1
  }
}