Pith Number

pith:4SM3LFBE

pith:2011:4SM3LFBENBI3YNYTGE5SSPEYWE

not attested not anchored not stored refs pending

Cycle killer... qu'est-ce que c'est? On the comparative approximability of hybridization number and directed feedback vertex set

Celine Scornavacca, Leen Stougie, Leo van Iersel, Nela Lekic, Simone Linz, Steven Kelk

arxiv:1112.5359 v1 · 2011-12-22 · math.CO · cs.DS · q-bio.QM

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4SM3LFBENBI3YNYTGE5SSPEYWE}

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	2026-05-18T04:05:47.476356Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e499b594246851bc3713313b293c98b13c49905b29026ea42fb70de7e5a8f02f

Aliases

arxiv: 1112.5359 · arxiv_version: 1112.5359v1 · doi: 10.48550/arxiv.1112.5359 · pith_short_12: 4SM3LFBENBI3 · pith_short_16: 4SM3LFBENBI3YNYT · pith_short_8: 4SM3LFBE

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/4SM3LFBENBI3YNYTGE5SSPEYWE \
  | 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: e499b594246851bc3713313b293c98b13c49905b29026ea42fb70de7e5a8f02f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7636ed5133d227a10a1db1be954b4b6398293aa9ed179bf219f495d47ee19e8b",
    "cross_cats_sorted": [
      "cs.DS",
      "q-bio.QM"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2011-12-22T15:58:01Z",
    "title_canon_sha256": "360f313af4b2e726de76fb567efcdeab48880bd5ba5a75a1505b9118a27bb698"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1112.5359",
    "kind": "arxiv",
    "version": 1
  }
}