Pith Number

pith:ESFCDPGN

pith:2009:ESFCDPGNG3CBWEB742R3FVNWRJ

not attested not anchored not stored refs pending

Neighbourhood Structures: Bisimilarity and Basic Model Theory

Clemens Kupke, Eric Pacuit, Helle Hvid Hansen

arxiv:0901.4430 v4 · 2009-01-28 · 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{ESFCDPGNG3CBWEB742R3FVNWRJ}

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	2026-05-18T01:37:40.549038Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

248a21bccd36c41b103fe6a3b2d5b68a4ef9b2d0ce540780ff9871c18eb7a987

Aliases

arxiv: 0901.4430 · arxiv_version: 0901.4430v4 · doi: 10.48550/arxiv.0901.4430 · pith_short_12: ESFCDPGNG3CB · pith_short_16: ESFCDPGNG3CBWEB7 · pith_short_8: ESFCDPGN

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/ESFCDPGNG3CBWEB742R3FVNWRJ \
  | 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: 248a21bccd36c41b103fe6a3b2d5b68a4ef9b2d0ce540780ff9871c18eb7a987

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "924706de63599527e99d06adec6f765e925138512b117cf1c950f2874e1a5744",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2009-01-28T10:29:44Z",
    "title_canon_sha256": "8443b08d5ebf3b8d56bae80037975e9e6861c406c17adbe4df103ef15cd7d56c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0901.4430",
    "kind": "arxiv",
    "version": 4
  }
}