Pith Number

pith:AC3XWG3Y

pith:2012:AC3XWG3YFGI5ZDYYC4EO2RJXYZ

not attested not anchored not stored refs pending

From Regexes to Parsing Expression Grammars

Fabio Mascarenhas, Roberto Ierusalimschy, S\'ergio Medeiros

arxiv:1210.4992 v1 · 2012-10-17 · cs.FL · cs.PL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{AC3XWG3YFGI5ZDYYC4EO2RJXYZ}

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	2026-05-18T02:59:06.500384Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

00b77b1b782991dc8f181708ed4537c64d4ae576c7585353148febb40269a8fe

Aliases

arxiv: 1210.4992 · arxiv_version: 1210.4992v1 · doi: 10.48550/arxiv.1210.4992 · pith_short_12: AC3XWG3YFGI5 · pith_short_16: AC3XWG3YFGI5ZDYY · pith_short_8: AC3XWG3Y

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/AC3XWG3YFGI5ZDYYC4EO2RJXYZ \
  | 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: 00b77b1b782991dc8f181708ed4537c64d4ae576c7585353148febb40269a8fe

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "297fd5ba7a22203bf8d60ad9ede3187a2b12e81dc80cdeb2cc5f2262f745ca97",
    "cross_cats_sorted": [
      "cs.PL"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2012-10-17T23:53:30Z",
    "title_canon_sha256": "1932ea71c22e59b9965cc429ea09586d8c91ec5195d2af236822c0d10cdafec8"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1210.4992",
    "kind": "arxiv",
    "version": 1
  }
}