Pith Number

pith:PQN77RX2

pith:2009:PQN77RX2BLPT34SJEW7DB3YSZG

not attested not anchored not stored refs pending

Polynomial-Time Approximation Schemes for Subset-Connectivity Problems in Bounded-Genus Graphs

Erik D. Demaine (MIT), Glencora Borradaile, Siamak Tazari

arxiv:0902.1043 v2 · 2009-02-06 · cs.DM · 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{PQN77RX2BLPT34SJEW7DB3YSZG}

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	2026-05-18T04:27:45.609698Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7c1bffc6fa0adf3df24925be30ef12c9a6fbf0c8bc630e3d8732b1635514e6cb

Aliases

arxiv: 0902.1043 · arxiv_version: 0902.1043v2 · doi: 10.48550/arxiv.0902.1043 · pith_short_12: PQN77RX2BLPT · pith_short_16: PQN77RX2BLPT34SJ · pith_short_8: PQN77RX2

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/PQN77RX2BLPT34SJEW7DB3YSZG \
  | 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: 7c1bffc6fa0adf3df24925be30ef12c9a6fbf0c8bc630e3d8732b1635514e6cb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a3bbe1033699a3bd244eb94e208279b9f2e8841fec11c3fbea9f6bc079379192",
    "cross_cats_sorted": [
      "cs.DS"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DM",
    "submitted_at": "2009-02-06T09:53:53Z",
    "title_canon_sha256": "79bc58b852115b96a1db771f44d33de83d5efe27fd8cd72bd239e07b1a693ccc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0902.1043",
    "kind": "arxiv",
    "version": 2
  }
}