Pith Number

pith:BUMYYX34

pith:2011:BUMYYX34K52BQDNYOX3VGOPNGD

not attested not anchored not stored refs pending

Counting Perfect Matchings as Fast as Ryser

Andreas Bj\"orklund

arxiv:1107.4466 v2 · 2011-07-22 · cs.DS

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{BUMYYX34K52BQDNYOX3VGOPNGD}

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	2026-05-18T04:10:58.471153Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0d198c5f7c5774180db875f75339ed30cfc42007d1302548ebf1f3c992efe820

Aliases

arxiv: 1107.4466 · arxiv_version: 1107.4466v2 · doi: 10.48550/arxiv.1107.4466 · pith_short_12: BUMYYX34K52B · pith_short_16: BUMYYX34K52BQDNY · pith_short_8: BUMYYX34

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/BUMYYX34K52BQDNYOX3VGOPNGD \
  | 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: 0d198c5f7c5774180db875f75339ed30cfc42007d1302548ebf1f3c992efe820

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2b8ff1d80f3577ee3716955e2a8ed1e2b688421902152061f53fff3816ad2a8d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2011-07-22T09:49:47Z",
    "title_canon_sha256": "649c923e22bb11db843b34b762244327315cceaf800f1ae1b664996d0b8ab05c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1107.4466",
    "kind": "arxiv",
    "version": 2
  }
}