Pith Number

pith:LFAOP24C

pith:2009:LFAOP24CTWJ6KYFN7SE7RKDKQ3

not attested not anchored not stored refs pending

A Linear Vertex Kernel for Maximum Internal Spanning Tree

Fedor V. Fomin, Saket Saurabh, Serge Gaspers, St\'ephan Thomass\'e

arxiv:0907.3208 v2 · 2009-07-20 · cs.DS · 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{LFAOP24CTWJ6KYFN7SE7RKDKQ3}

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	2026-05-18T04:01:00.233965Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

5940e7eb829d93e560adfc89f8a86a86ca2061439b4b89434809b00721be7ef4

Aliases

arxiv: 0907.3208 · arxiv_version: 0907.3208v2 · doi: 10.48550/arxiv.0907.3208 · pith_short_12: LFAOP24CTWJ6 · pith_short_16: LFAOP24CTWJ6KYFN · pith_short_8: LFAOP24C

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/LFAOP24CTWJ6KYFN7SE7RKDKQ3 \
  | 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: 5940e7eb829d93e560adfc89f8a86a86ca2061439b4b89434809b00721be7ef4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7f5617ce197168aa3ed3e9e547893474a9a0d43db770295c6eee8dc8d251a986",
    "cross_cats_sorted": [
      "cs.DM"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2009-07-20T18:50:55Z",
    "title_canon_sha256": "cdecee3c89e18570f9b0a0240c5b482fa0f135d28d8e7304fd26b876a8e43da0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0907.3208",
    "kind": "arxiv",
    "version": 2
  }
}