Pith Number

pith:QVT7B7IR

pith:2009:QVT7B7IR4UXRB55FXGVCFMB3TB

not attested not anchored not stored refs pending

A boundary between universality and non-universality in spiking neural P systems

Turlough Neary

arxiv:0912.0741 v2 · 2009-12-04 · cs.CC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QVT7B7IR4UXRB55FXGVCFMB3TB}

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	2026-05-18T02:24:45.914797Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8567f0fd11e52f10f7a5b9aa22b03b9851c7c2e9333680de39e9208591da1463

Aliases

arxiv: 0912.0741 · arxiv_version: 0912.0741v2 · doi: 10.48550/arxiv.0912.0741 · pith_short_12: QVT7B7IR4UXR · pith_short_16: QVT7B7IR4UXRB55F · pith_short_8: QVT7B7IR

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/QVT7B7IR4UXRB55FXGVCFMB3TB \
  | 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: 8567f0fd11e52f10f7a5b9aa22b03b9851c7c2e9333680de39e9208591da1463

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b77c2b2d70fe34691f6d8fcdba24185ec185d064882b7e5d04604e46f27c4cff",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2009-12-04T20:36:55Z",
    "title_canon_sha256": "c68d6797b370544eac263e7715cf30741a9074ab30b7dc1056aeae186023c864"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0912.0741",
    "kind": "arxiv",
    "version": 2
  }
}