Pith Number

pith:IVNE7UY7

pith:2006:IVNE7UY7XHW66BEAHFMEPLX4VM

not attested not anchored not stored refs pending

Logics for Unranked Trees: An Overview

Leonid Libkin

arxiv:cs/0606062 v2 · 2006-06-13 · cs.LO · cs.DB

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{IVNE7UY7XHW66BEAHFMEPLX4VM}

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	2026-05-18T00:53:03.376309Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

455a4fd31fb9edef0480395847aefcab3f6d60e5cea6e57725447eef0a489b8e

Aliases

arxiv: cs/0606062 · arxiv_version: cs/0606062v2 · doi: 10.48550/arxiv.cs/0606062 · pith_short_12: IVNE7UY7XHW6 · pith_short_16: IVNE7UY7XHW66BEA · pith_short_8: IVNE7UY7

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/IVNE7UY7XHW66BEAHFMEPLX4VM \
  | 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: 455a4fd31fb9edef0480395847aefcab3f6d60e5cea6e57725447eef0a489b8e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2d0f5e17dfc76d95801f993e30c2b86596b747bfbcea16d796ba0c09c5fcb218",
    "cross_cats_sorted": [
      "cs.DB"
    ],
    "license": "",
    "primary_cat": "cs.LO",
    "submitted_at": "2006-06-13T16:27:28Z",
    "title_canon_sha256": "d9ceeb5876b112c10863ded41006e9bcf2a3b36bf6133c68d860a304bb0b155b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "cs/0606062",
    "kind": "arxiv",
    "version": 2
  }
}