Pith Number

pith:GBJDM3QI

pith:2012:GBJDM3QIHMMZNTZU76TZXYL3HF

not attested not anchored not stored refs pending

First-Order Logic on Higher-Order Nested Pushdown Trees

Alexander Kartzow

arxiv:1202.1980 v1 · 2012-02-09 · 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{GBJDM3QIHMMZNTZU76TZXYL3HF}

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	2026-05-18T04:02:38.615063Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3052366e083b1996cf34ffa79be17b39536e93e60c879e544a4bfdf1bb9f639e

Aliases

arxiv: 1202.1980 · arxiv_version: 1202.1980v1 · doi: 10.48550/arxiv.1202.1980 · pith_short_12: GBJDM3QIHMMZ · pith_short_16: GBJDM3QIHMMZNTZU · pith_short_8: GBJDM3QI

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/GBJDM3QIHMMZNTZU76TZXYL3HF \
  | 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: 3052366e083b1996cf34ffa79be17b39536e93e60c879e544a4bfdf1bb9f639e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6432b152f9abb6b7d15a8b1d4827692698a19b382f69cb9534d250f2a44fb208",
    "cross_cats_sorted": [
      "cs.FL",
      "math.LO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2012-02-09T13:37:40Z",
    "title_canon_sha256": "de2b9eada9a7bbecbed93569ec520aaa7d6a5e452555eb442d1f923057a35a37"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1202.1980",
    "kind": "arxiv",
    "version": 1
  }
}