Pith Number

pith:MUZYAGFS

pith:2009:MUZYAGFSSV7ZFUR6LRAJSPOMBA

not attested not anchored not stored refs pending

Comparison of two techniques for proving nonexistence of strongly regular graphs

Vasek Chvatal

arxiv:0906.5389 v1 · 2009-06-30 · math.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{MUZYAGFSSV7ZFUR6LRAJSPOMBA}

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	2026-05-18T03:56:23.001858Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

65338018b2957f92d23e5c40993dcc083376d8ec0c592000d1fa8e84162bab0d

Aliases

arxiv: 0906.5389 · arxiv_version: 0906.5389v1 · doi: 10.48550/arxiv.0906.5389 · pith_short_12: MUZYAGFSSV7Z · pith_short_16: MUZYAGFSSV7ZFUR6 · pith_short_8: MUZYAGFS

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/MUZYAGFSSV7ZFUR6LRAJSPOMBA \
  | 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: 65338018b2957f92d23e5c40993dcc083376d8ec0c592000d1fa8e84162bab0d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "030381bbd82428d43f45900102971d850230f3a4ecb8e55a1482b012ec0c1cd5",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2009-06-30T00:35:06Z",
    "title_canon_sha256": "569391fcad94c0ab2dbaa414f0b971dc01a75c805a8d4fb493796edb0c8dd5b5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0906.5389",
    "kind": "arxiv",
    "version": 1
  }
}