Pith Number

pith:KOC2V7HM

pith:2016:KOC2V7HMMWHICCKLL2WKLGZ42U

not attested not anchored not stored refs pending

Permutations of context-free, ET0L and indexed languages

Georg Zetzsche, Laura Ciobanu, Murray Elder, Tara Brough

arxiv:1604.05431 v2 · 2016-04-19 · 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{KOC2V7HMMWHICCKLL2WKLGZ42U}

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	2026-05-18T01:13:23.330677Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

5385aafcec658e81094b5eaca59b3cd5266f82b5aedccf13aa76c343f899de3c

Aliases

arxiv: 1604.05431 · arxiv_version: 1604.05431v2 · doi: 10.48550/arxiv.1604.05431 · pith_short_12: KOC2V7HMMWHI · pith_short_16: KOC2V7HMMWHICCKL · pith_short_8: KOC2V7HM

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/KOC2V7HMMWHICCKLL2WKLGZ42U \
  | 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: 5385aafcec658e81094b5eaca59b3cd5266f82b5aedccf13aa76c343f899de3c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6d90b39b7fd05c6a7a875656e8f84679a98259bed26d0f3bea3d0e6cd8202444",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2016-04-19T05:07:56Z",
    "title_canon_sha256": "bee5e6736c8b0c1f2d2739efa4449fe08a37601722dfc89cf2ca735fcb7eb155"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1604.05431",
    "kind": "arxiv",
    "version": 2
  }
}