Pith Number

pith:SDNNLMMP

pith:2017:SDNNLMMPWWK6HVLVACJMKQFYFX

not attested not anchored not stored refs pending

Regularity of languages generated by non context-free grammars over a singleton terminal alphabet

Alberto Pettorossi, Maurizio Proietti

arxiv:1705.09695 v2 · 2017-05-26 · 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{SDNNLMMPWWK6HVLVACJMKQFYFX}

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	2026-05-18T00:10:57.229015Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

90dad5b18fb595e3d5750092c540b82de3143d59232b7d450f310f903c75a71b

Aliases

arxiv: 1705.09695 · arxiv_version: 1705.09695v2 · doi: 10.48550/arxiv.1705.09695 · pith_short_12: SDNNLMMPWWK6 · pith_short_16: SDNNLMMPWWK6HVLV · pith_short_8: SDNNLMMP

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/SDNNLMMPWWK6HVLVACJMKQFYFX \
  | 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: 90dad5b18fb595e3d5750092c540b82de3143d59232b7d450f310f903c75a71b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "36742b3c1ce8e1fcbb6f5bc5bca754175c41162daf7652064c238d1e15fa3354",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2017-05-26T19:46:02Z",
    "title_canon_sha256": "c53f952be6b1b426e5294f0c523677ddd3dff523ae294cb41fb0170c4ca6553a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1705.09695",
    "kind": "arxiv",
    "version": 2
  }
}