Pith Number

pith:2WKC4JYY

pith:2012:2WKC4JYYCX5YQNC33EVG5ZCXG4

not attested not anchored not stored refs pending

Topology Inspired Problems for Cellular Automata, and a Counterexample in Topology

Finland), Ilkka T\"orm\"a (University of Turku, Ville Salo (University of Turku

arxiv:1208.2783 v1 · 2012-08-14 · nlin.CG · cs.FL · math.GN

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2WKC4JYYCX5YQNC33EVG5ZCXG4}

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	2026-05-18T03:48:47.263587Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d5942e271815fb88345bd92a6ee4573700f5591ee7dd8799ce2373d60e1a7837

Aliases

arxiv: 1208.2783 · arxiv_version: 1208.2783v1 · doi: 10.48550/arxiv.1208.2783 · pith_short_12: 2WKC4JYYCX5Y · pith_short_16: 2WKC4JYYCX5YQNC3 · pith_short_8: 2WKC4JYY

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/2WKC4JYYCX5YQNC33EVG5ZCXG4 \
  | 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: d5942e271815fb88345bd92a6ee4573700f5591ee7dd8799ce2373d60e1a7837

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "946bc4e00704ce7978bd8a749123eb950bc86edab95e5dad3e01b563ea4e5d8f",
    "cross_cats_sorted": [
      "cs.FL",
      "math.GN"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "nlin.CG",
    "submitted_at": "2012-08-14T04:43:57Z",
    "title_canon_sha256": "73acc20d571d3680163fa23ea0cb3b67b14ad686b57a7858cdc070e753bf0e55"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1208.2783",
    "kind": "arxiv",
    "version": 1
  }
}