Pith Number

pith:QFBR6GB5

pith:2018:QFBR6GB5RQ43FMVBCO3SKNLZA2

not attested not anchored not stored refs pending

Reasoning about exceptions in ontologies: from the lexicographic closure to the skeptical closure

Laura Giordano, Valentina Gliozzi

arxiv:1807.02879 v1 · 2018-07-08 · cs.AI

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QFBR6GB5RQ43FMVBCO3SKNLZA2}

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	2026-05-18T00:11:13.482266Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

81431f183d8c39b2b2a113b725357906a05e7fe6b5501724d6aaedd1758cc3ae

Aliases

arxiv: 1807.02879 · arxiv_version: 1807.02879v1 · doi: 10.48550/arxiv.1807.02879 · pith_short_12: QFBR6GB5RQ43 · pith_short_16: QFBR6GB5RQ43FMVB · pith_short_8: QFBR6GB5

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/QFBR6GB5RQ43FMVBCO3SKNLZA2 \
  | 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: 81431f183d8c39b2b2a113b725357906a05e7fe6b5501724d6aaedd1758cc3ae

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "30e38346896b4ad3823d0d43969694bf2fba66ee3c9291eb4f4933a50fdbe9e9",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.AI",
    "submitted_at": "2018-07-08T20:28:54Z",
    "title_canon_sha256": "60dc824618677dd6f8d8936bce93a3cf44b067fdb6758479514dd1f963bb64d4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1807.02879",
    "kind": "arxiv",
    "version": 1
  }
}