Pith Number

pith:QN2D6J7Z

pith:2014:QN2D6J7Z34UP6HLS4PBD4TJDCG

not attested not anchored not stored refs pending

Deciding the Borel complexity of regular tree languages

Alessandro Facchini, Henryk Michalewski

arxiv:1403.3502 v1 · 2014-03-14 · cs.LO · cs.FL · math.LO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QN2D6J7Z34UP6HLS4PBD4TJDCG}

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	2026-05-18T02:56:20.286918Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

83743f27f9df28ff1d72e3c23e4d23118c97628ed0100ef25b2e125681752026

Aliases

arxiv: 1403.3502 · arxiv_version: 1403.3502v1 · doi: 10.48550/arxiv.1403.3502 · pith_short_12: QN2D6J7Z34UP · pith_short_16: QN2D6J7Z34UP6HLS · pith_short_8: QN2D6J7Z

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/QN2D6J7Z34UP6HLS4PBD4TJDCG \
  | 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: 83743f27f9df28ff1d72e3c23e4d23118c97628ed0100ef25b2e125681752026

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c695d5e3b7333bbed9b7a7664dd7003d251cb36a723037213bf13dd6480f5d47",
    "cross_cats_sorted": [
      "cs.FL",
      "math.LO"
    ],
    "license": "http://creativecommons.org/licenses/by-nc-sa/3.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2014-03-14T08:41:02Z",
    "title_canon_sha256": "24ea267dac6d4ceec3c31cd2bb91425344f6f8881fe4da2401f512ac0447d866"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1403.3502",
    "kind": "arxiv",
    "version": 1
  }
}