Pith Number

pith:TCI7PLXN

pith:2018:TCI7PLXNZF7TQEMQMH66TABK5S

not attested not anchored not stored refs pending

Comparing Downward Fragments of the Relational Calculus with Transitive Closure on Trees

Dirk Van Gucht, George H. L. Fletcher, Jan Van den Bussche, Jelle Hellings, Marc Gyssens, Stijn Vansummeren, Yuqing Wu

arxiv:1803.01390 v1 · 2018-03-04 · cs.DB

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{TCI7PLXNZF7TQEMQMH66TABK5S}

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	2026-05-18T00:22:00.805755Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9891f7aeedc97f38119061fde9802aecad4ec0134cd77504e8468282c077b677

Aliases

arxiv: 1803.01390 · arxiv_version: 1803.01390v1 · doi: 10.48550/arxiv.1803.01390 · pith_short_12: TCI7PLXNZF7T · pith_short_16: TCI7PLXNZF7TQEMQ · pith_short_8: TCI7PLXN

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/TCI7PLXNZF7TQEMQMH66TABK5S \
  | 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: 9891f7aeedc97f38119061fde9802aecad4ec0134cd77504e8468282c077b677

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f99b7066267b83b1e0cd094f9578234022dbbd84b930c8884c6f486212109c9d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DB",
    "submitted_at": "2018-03-04T17:38:51Z",
    "title_canon_sha256": "f6beac402cc62c4e79bdc6f438ec5f2ac3f32d0970d80fe2b2786f82ab899b75"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1803.01390",
    "kind": "arxiv",
    "version": 1
  }
}