Pith Number

pith:IHWDS4V2

pith:1994:IHWDS4V2LHQQ6DLUNRWWZSJQTV

not attested not anchored not stored refs pending

Towards History-based Grammars: Using Richer Models for Probabilistic Parsing

David M. Magerman, Ezra Black, Fred Jelinek, John Lafferty, Robert Mercer, Salim Roukos

arxiv:cmp-lg/9405007 v1 · 1994-05-03 · cmp-lg · cs.CL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{IHWDS4V2LHQQ6DLUNRWWZSJQTV}

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	2026-07-04T15:08:21.559096Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

41ec3972ba59e10f0d746c6d6cc9309d4d749a1801c25b3f256ef74e8b1e51ac

Aliases

arxiv: cmp-lg/9405007 · arxiv_version: cmp-lg/9405007v1 · doi: 10.48550/arxiv.cmp-lg/9405007 · pith_short_12: IHWDS4V2LHQQ · pith_short_16: IHWDS4V2LHQQ6DLU · pith_short_8: IHWDS4V2

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/IHWDS4V2LHQQ6DLUNRWWZSJQTV \
  | 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: 41ec3972ba59e10f0d746c6d6cc9309d4d749a1801c25b3f256ef74e8b1e51ac

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6775643aefa6eb9e28b426db4176bf246ec2fee36cfb73dcefa102f272266ec1",
    "cross_cats_sorted": [
      "cs.CL"
    ],
    "license": "",
    "primary_cat": "cmp-lg",
    "submitted_at": "1994-05-03T15:01:24Z",
    "title_canon_sha256": "dc2d1edf591e8ad527d2e7f05872bb4d1c87a31c780bc26acc07d840fc0fc66b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "cmp-lg/9405007",
    "kind": "arxiv",
    "version": 1
  }
}