Pith Number

pith:PYCPMJX2

pith:2009:PYCPMJX24BDR3NKQMNDKJ4LOI5

not attested not anchored not stored refs pending

Matrix Graph Grammars as a Model of Computation

Pedro Pablo Perez Velasco

arxiv:0905.1202 v3 · 2009-05-08 · cs.DM · cs.CC · 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{PYCPMJX24BDR3NKQMNDKJ4LOI5}

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	2026-07-04T17:15:48.833641Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7e04f626fae0471db5506346a4f16e47754d8c03ac811aacbdfb3e1c9e7bad07

Aliases

arxiv: 0905.1202 · arxiv_version: 0905.1202v3 · doi: 10.48550/arxiv.0905.1202 · pith_short_12: PYCPMJX24BDR · pith_short_16: PYCPMJX24BDR3NKQ · pith_short_8: PYCPMJX2

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/PYCPMJX24BDR3NKQMNDKJ4LOI5 \
  | 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: 7e04f626fae0471db5506346a4f16e47754d8c03ac811aacbdfb3e1c9e7bad07

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "601dcf7274c5af98d40b9b6bf825e357f72649b9abfb7bbb0142e8ced680b7a3",
    "cross_cats_sorted": [
      "cs.CC",
      "cs.FL"
    ],
    "license": "http://creativecommons.org/licenses/by-nc-sa/3.0/",
    "primary_cat": "cs.DM",
    "submitted_at": "2009-05-08T08:35:23Z",
    "title_canon_sha256": "0e449353a97acec12e07716000d8b7cdd3e1ccac6c068248c05677e7fbd08e05"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0905.1202",
    "kind": "arxiv",
    "version": 3
  }
}