Pith Number

pith:NQ3CLY5L

pith:2012:NQ3CLY5LEIDVVFJDOFEMRWO3XT

not attested not anchored not stored refs pending

A family of weakly universal cellular automata in the hyperbolic plane with two states

Maurice Margenstern

arxiv:1202.1709 v1 · 2012-02-08 · cs.FL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{NQ3CLY5LEIDVVFJDOFEMRWO3XT}

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	2026-05-18T04:02:51.352476Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6c3625e3ab22075a95237148c8d9dbbcd9c10f6087a76d33dc1e14475b792567

Aliases

arxiv: 1202.1709 · arxiv_version: 1202.1709v1 · doi: 10.48550/arxiv.1202.1709 · pith_short_12: NQ3CLY5LEIDV · pith_short_16: NQ3CLY5LEIDVVFJD · pith_short_8: NQ3CLY5L

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/NQ3CLY5LEIDVVFJDOFEMRWO3XT \
  | 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: 6c3625e3ab22075a95237148c8d9dbbcd9c10f6087a76d33dc1e14475b792567

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "67f21870aa9ef31f57e7e46a6bab51bfc800f6d88c782f19f8690d9405b11cec",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.FL",
    "submitted_at": "2012-02-08T14:34:30Z",
    "title_canon_sha256": "f854a738adb8175021eec9f6ae81bbe27087d6e81931018b47c63dfb61e604ff"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1202.1709",
    "kind": "arxiv",
    "version": 1
  }
}