Pith Number

pith:6Q3DF5FP

pith:2012:6Q3DF5FPNJ5OK6NG3KRRDPJ7O2

not attested not anchored not stored refs pending

Left Recursion in Parsing Expression Grammars

Fabio Mascarenhas, Roberto Ierusalimschy, S\'ergio Medeiros

arxiv:1207.0443 v3 · 2012-07-02 · 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{6Q3DF5FPNJ5OK6NG3KRRDPJ7O2}

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	2026-05-18T02:59:06.551341Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f43632f4af6a7ae579a6daa311bd3f76b996d04ee263c6ec81d9945355566d66

Aliases

arxiv: 1207.0443 · arxiv_version: 1207.0443v3 · doi: 10.48550/arxiv.1207.0443 · pith_short_12: 6Q3DF5FPNJ5O · pith_short_16: 6Q3DF5FPNJ5OK6NG · pith_short_8: 6Q3DF5FP

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/6Q3DF5FPNJ5OK6NG3KRRDPJ7O2 \
  | 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: f43632f4af6a7ae579a6daa311bd3f76b996d04ee263c6ec81d9945355566d66

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f493373730afc775f4cab94c4fc00a6be936fa60e018e2fb2fdc6e17f072125f",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2012-07-02T16:48:50Z",
    "title_canon_sha256": "866230c76d27e2d89174b130e9230fc6da9292ad66f3bb2c60de6f17d7ab41c4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1207.0443",
    "kind": "arxiv",
    "version": 3
  }
}