Pith Number

pith:6UX27EJG

pith:2012:6UX27EJG2TLU4HKPLHUN6H6HBK

not attested not anchored not stored refs pending

Automata for two-variable logic over trees with ordered data values

Tony Tan

arxiv:1212.3251 v2 · 2012-12-13 · 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{6UX27EJG2TLU4HKPLHUN6H6HBK}

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	2026-05-18T03:11:24.060010Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f52faf9126d4d74e1d4f59e8df1fc70a99849a51ee9df1a29a962db727947c5e

Aliases

arxiv: 1212.3251 · arxiv_version: 1212.3251v2 · doi: 10.48550/arxiv.1212.3251 · pith_short_12: 6UX27EJG2TLU · pith_short_16: 6UX27EJG2TLU4HKP · pith_short_8: 6UX27EJG

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/6UX27EJG2TLU4HKPLHUN6H6HBK \
  | 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: f52faf9126d4d74e1d4f59e8df1fc70a99849a51ee9df1a29a962db727947c5e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2ca9daa328ca4220962b174eeb4175b12dae0db676a479725c633b427ba7a7e3",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2012-12-13T18:18:54Z",
    "title_canon_sha256": "b3bf3776e944f127415065d008c19e5a5c34d92e73b0c9e9d11a9dbea4112bd6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1212.3251",
    "kind": "arxiv",
    "version": 2
  }
}