Pith Number

pith:UVDNK7ZZ

pith:2019:UVDNK7ZZBW5B5VORMXCGXXGPNA

not attested not anchored not stored refs pending

On the Density of Context-Free and Counter Languages

Ian McQuillan, Joey Eremondi, Oscar H. Ibarra

arxiv:1903.03001 v1 · 2019-03-07 · 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{UVDNK7ZZBW5B5VORMXCGXXGPNA}

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	2026-05-17T23:51:50.455069Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a546d57f390dba1ed5d165c46bdccf6802018aecf0c60904566ffe017343f617

Aliases

arxiv: 1903.03001 · arxiv_version: 1903.03001v1 · doi: 10.48550/arxiv.1903.03001 · pith_short_12: UVDNK7ZZBW5B · pith_short_16: UVDNK7ZZBW5B5VOR · pith_short_8: UVDNK7ZZ

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/UVDNK7ZZBW5B5VORMXCGXXGPNA \
  | 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: a546d57f390dba1ed5d165c46bdccf6802018aecf0c60904566ffe017343f617

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ae51973616d0e275cc7af3eaebc71d3b598c4e0d399adbda4e09c020bc827437",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2019-03-07T15:38:17Z",
    "title_canon_sha256": "72c732a3afc0e94b3443f3f14338388e0b23a2df585f4c98aa79e9b68f7f6dfb"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1903.03001",
    "kind": "arxiv",
    "version": 1
  }
}