Pith Number

pith:I6AFU4K3

pith:2010:I6AFU4K3OJS36D2HLLDSYXJDWO

not attested not anchored not stored refs pending

Subset feedback vertex set is fixed parameter tractable

Jakub Onufry Wojtaszczyk, Marcin Pilipczuk, Marek Cygan, Michal Pilipczuk

arxiv:1004.2972 v3 · 2010-04-17 · cs.DS · cs.CC

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

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	2026-05-18T04:16:32.259487Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

47805a715b7265bf0f475ac72c5d23b3bad237d09901d09d129a258b1b702497

Aliases

arxiv: 1004.2972 · arxiv_version: 1004.2972v3 · doi: 10.48550/arxiv.1004.2972 · pith_short_12: I6AFU4K3OJS3 · pith_short_16: I6AFU4K3OJS36D2H · pith_short_8: I6AFU4K3

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/I6AFU4K3OJS36D2HLLDSYXJDWO \
  | 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: 47805a715b7265bf0f475ac72c5d23b3bad237d09901d09d129a258b1b702497

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "605eee1d8678a27dd29a356fb9b53e128a88403f89411405ce9a5044c19dcbf7",
    "cross_cats_sorted": [
      "cs.CC"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2010-04-17T17:19:47Z",
    "title_canon_sha256": "467914be5e0169afc84a2bf364cd056478df0b5abfe76b535baf70d4787df970"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1004.2972",
    "kind": "arxiv",
    "version": 3
  }
}