Pith Number

pith:M7HEVZHR

pith:2018:M7HEVZHRP4VUEZKKLGYSPADYUH

not attested not anchored not stored refs pending

Unsupervised Grammar Induction with Depth-bounded PCFG

Finale Doshi-Velez, Lane Schwartz, Lifeng Jin, Timothy Miller, William Schuler

arxiv:1802.08545 v2 · 2018-02-23 · cs.CL · cs.AI

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{M7HEVZHRP4VUEZKKLGYSPADYUH}

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	2026-05-18T00:22:36.745619Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

67ce4ae4f17f2b42654a59b1278078a1f66a8202f216abd1894c45fe8c232b77

Aliases

arxiv: 1802.08545 · arxiv_version: 1802.08545v2 · doi: 10.48550/arxiv.1802.08545 · pith_short_12: M7HEVZHRP4VU · pith_short_16: M7HEVZHRP4VUEZKK · pith_short_8: M7HEVZHR

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/M7HEVZHRP4VUEZKKLGYSPADYUH \
  | 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: 67ce4ae4f17f2b42654a59b1278078a1f66a8202f216abd1894c45fe8c232b77

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b420dbbdf676573bc9416bb744e094c7876fc8568c1cac5ebe0f3c66d7aa9c6e",
    "cross_cats_sorted": [
      "cs.AI"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CL",
    "submitted_at": "2018-02-23T14:30:00Z",
    "title_canon_sha256": "9be6c846b5d7d55dce23721da3ca8485b3f0dd6e3f1fe638ca8a5e5a3803cc00"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1802.08545",
    "kind": "arxiv",
    "version": 2
  }
}