Pith Number

pith:ZORWJDDS

pith:2012:ZORWJDDSVBJBDQJDIERGN4FRPL

not attested not anchored not stored refs pending

The FC-rank of a context-free language

Arnaud Carayol, Zoltan Esik

arxiv:1202.6275 v2 · 2012-02-28 · cs.FL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ZORWJDDSVBJBDQJDIERGN4FRPL}

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	2026-05-18T02:21:17.488890Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

cba3648c72a85211c123412266f0b17ad133720dd7ef465eeb0074895315a984

Aliases

arxiv: 1202.6275 · arxiv_version: 1202.6275v2 · doi: 10.48550/arxiv.1202.6275 · pith_short_12: ZORWJDDSVBJB · pith_short_16: ZORWJDDSVBJBDQJD · pith_short_8: ZORWJDDS

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/ZORWJDDSVBJBDQJDIERGN4FRPL \
  | 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: cba3648c72a85211c123412266f0b17ad133720dd7ef465eeb0074895315a984

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9a5ec517b42fe64cdb46eacc20c3873ef9132ce30ddded065b945689a2cee537",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2012-02-28T16:41:44Z",
    "title_canon_sha256": "ed8f9416cb4c5c61bb5c48ca11b7240247854932ad3f85b1754c840c3dad719d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1202.6275",
    "kind": "arxiv",
    "version": 2
  }
}