Pith Number

pith:FRQYIIDY

pith:2010:FRQYIIDYAFFVNCMXKGSD7KXY3U

not attested not anchored not stored refs pending

Tree Languages Defined in First-Order Logic with One Quantifier Alternation

Luc Segoufin (INRIA), Mikolaj Bojanczyk (Warsaw University)

arxiv:1009.2854 v2 · 2010-09-15 · cs.FL · cs.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{FRQYIIDYAFFVNCMXKGSD7KXY3U}

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	2026-05-17T23:51:24.147870Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2c61842078014b56899751a43faaf8dd0f517afd95d04f06ce481fa2195d2105

Aliases

arxiv: 1009.2854 · arxiv_version: 1009.2854v2 · doi: 10.48550/arxiv.1009.2854 · pith_short_12: FRQYIIDYAFFV · pith_short_16: FRQYIIDYAFFVNCMX · pith_short_8: FRQYIIDY

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/FRQYIIDYAFFVNCMXKGSD7KXY3U \
  | 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: 2c61842078014b56899751a43faaf8dd0f517afd95d04f06ce481fa2195d2105

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f16e8f36f352b56f5cc23ed1c68226315e36ae89257d55507096861c772d5cc7",
    "cross_cats_sorted": [
      "cs.LO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2010-09-15T07:15:59Z",
    "title_canon_sha256": "45db24e8bdc68b50058b0c8ce37e68709d8d375abca83b3c8e9073ff9f2cc21d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1009.2854",
    "kind": "arxiv",
    "version": 2
  }
}