Pith Number

pith:Q3PFVDE6

pith:2014:Q3PFVDE6IAVMWHP2EMWZZN7O3P

not attested not anchored not stored refs pending

Learning cover context-free grammars from structural data

Gabriel Istrate, Mircea Marin

arxiv:1404.2409 v1 · 2014-04-09 · 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{Q3PFVDE6IAVMWHP2EMWZZN7O3P}

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	2026-05-18T02:54:31.589277Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

86de5a8c9e402acb1dfa232d9cb7eedbf7416fb39eb63cfc255dc048f44ca1cf

Aliases

arxiv: 1404.2409 · arxiv_version: 1404.2409v1 · doi: 10.48550/arxiv.1404.2409 · pith_short_12: Q3PFVDE6IAVM · pith_short_16: Q3PFVDE6IAVMWHP2 · pith_short_8: Q3PFVDE6

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/Q3PFVDE6IAVMWHP2EMWZZN7O3P \
  | 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: 86de5a8c9e402acb1dfa232d9cb7eedbf7416fb39eb63cfc255dc048f44ca1cf

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6ed4d07d8a547c26d6c028a79146d6bd7182989e71e8e1a963ca0288668189ee",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2014-04-09T09:41:01Z",
    "title_canon_sha256": "7b268f55f046b0f3f0efd85eee051920aa763a5bd7f3f8449c24a877977ce737"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1404.2409",
    "kind": "arxiv",
    "version": 1
  }
}