Pith Number

pith:27Q3LAV5

pith:2008:27Q3LAV545VLJRZW3YCAGGPURL

not attested not anchored not stored refs pending

On the expressive power of permanents and perfect matchings of matrices of bounded pathwidth/cliquewidth

Laurent Lyaudet (LIP), Uffe Flarup (IMADA)

arxiv:0801.3408 v1 · 2008-01-22 · cs.DM

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{27Q3LAV545VLJRZW3YCAGGPURL}

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	2026-07-04T15:06:59.982854Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d7e1b582bde76ab4c736de040319f48ad9b7592c3c3be0fc22b0d1a5a4792ac9

Aliases

arxiv: 0801.3408 · arxiv_version: 0801.3408v1 · doi: 10.48550/arxiv.0801.3408 · pith_short_12: 27Q3LAV545VL · pith_short_16: 27Q3LAV545VLJRZW · pith_short_8: 27Q3LAV5

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/27Q3LAV545VLJRZW3YCAGGPURL \
  | 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: d7e1b582bde76ab4c736de040319f48ad9b7592c3c3be0fc22b0d1a5a4792ac9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7ec3611e738648c0ffb8f8a0583bc3b7f44fcdfba8b32ae412b53f322d205bb4",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "cs.DM",
    "submitted_at": "2008-01-22T16:35:15Z",
    "title_canon_sha256": "9e73609f0c175337ccba695555fb992a3afe6efd25887f1f207d1fd4dcc3d478"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0801.3408",
    "kind": "arxiv",
    "version": 1
  }
}