Pith Number

pith:IP2H3WZF

pith:2018:IP2H3WZFKWCZFVRVONTJI22ZPD

not attested not anchored not stored refs pending

A decidability result for the halting problem of cellular automata in the pentagrid

Maurice Margenstern

arxiv:1812.03882 v1 · 2018-12-10 · cs.FL · nlin.CG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{IP2H3WZFKWCZFVRVONTJI22ZPD}

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	2026-05-17T23:58:43.666302Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

43f47ddb25558592d6357366946b5978c95f796a6ba110d9ff4f2fe8df66fcfb

Aliases

arxiv: 1812.03882 · arxiv_version: 1812.03882v1 · doi: 10.48550/arxiv.1812.03882 · pith_short_12: IP2H3WZFKWCZ · pith_short_16: IP2H3WZFKWCZFVRV · pith_short_8: IP2H3WZF

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/IP2H3WZFKWCZFVRVONTJI22ZPD \
  | 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: 43f47ddb25558592d6357366946b5978c95f796a6ba110d9ff4f2fe8df66fcfb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "702166ce114f0deb2c33d2eadc444413f503bd465244a76f0d0922103992af9b",
    "cross_cats_sorted": [
      "nlin.CG"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2018-12-10T15:43:20Z",
    "title_canon_sha256": "f6464c08925d33e893fd33e063ad3db9ad45d786b5d395faf13cec15f2393f92"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1812.03882",
    "kind": "arxiv",
    "version": 1
  }
}