Pith Number

pith:ACQNRQH2

pith:2012:ACQNRQH2IHGH3K6AUOZLEN72K4

not attested not anchored not stored refs pending

Surjunctivity and reversibility of cellular automata over concrete categories

Michel Coornaert, Tullio Ceccherini-Silberstein

arxiv:1203.6492 v2 · 2012-03-29 · math.DS · math.GR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ACQNRQH2IHGH3K6AUOZLEN72K4}

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	2026-05-18T03:34:38.293524Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

00a0d8c0fa41cc7dabc0a3b2b237fa5734b0aa58e9e2c3ecb357492bdca50259

Aliases

arxiv: 1203.6492 · arxiv_version: 1203.6492v2 · doi: 10.48550/arxiv.1203.6492 · pith_short_12: ACQNRQH2IHGH · pith_short_16: ACQNRQH2IHGH3K6A · pith_short_8: ACQNRQH2

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/ACQNRQH2IHGH3K6AUOZLEN72K4 \
  | 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: 00a0d8c0fa41cc7dabc0a3b2b237fa5734b0aa58e9e2c3ecb357492bdca50259

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "12990a94c0b4a4db3495ef4173f927120d41e921a54a906f08412a5662429731",
    "cross_cats_sorted": [
      "math.GR"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.DS",
    "submitted_at": "2012-03-29T11:42:45Z",
    "title_canon_sha256": "387f7226409d3c362346ae16c03db5a9968db43eb42b3b2c9618b1c7be212472"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1203.6492",
    "kind": "arxiv",
    "version": 2
  }
}