Pith Number

pith:D5QCBK6S

pith:2009:D5QCBK6SNZFOHSUVQ5HJZEDU7S

not attested not anchored not stored refs pending

Bipartite graphs with five eigenvalues and pseudo designs

Ebrahim Ghorbani

arxiv:0905.2740 v3 · 2009-05-17 · 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{D5QCBK6SNZFOHSUVQ5HJZEDU7S}

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	2026-05-18T04:08:24.752529Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1f6020abd26e4ae3ca95874e9c9074fca116d1e335a1fba9c13b714fc34683ba

Aliases

arxiv: 0905.2740 · arxiv_version: 0905.2740v3 · doi: 10.48550/arxiv.0905.2740 · pith_short_12: D5QCBK6SNZFO · pith_short_16: D5QCBK6SNZFOHSUV · pith_short_8: D5QCBK6S

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/D5QCBK6SNZFOHSUVQ5HJZEDU7S \
  | 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: 1f6020abd26e4ae3ca95874e9c9074fca116d1e335a1fba9c13b714fc34683ba

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d8eaedaa787a16fb013fcf66eef588eee7faceda49e20740f2ce3f46c0eae563",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2009-05-17T14:00:46Z",
    "title_canon_sha256": "df2af752b6dc5fbd8340e5099bd97eb2a7179dbdc058844d68de9b8c8cb7eeef"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0905.2740",
    "kind": "arxiv",
    "version": 3
  }
}