Pith Number

pith:VFK4RVYA

pith:2023:VFK4RVYAXGMNGXP3TRBYRLU4IW

not attested not anchored not stored refs pending

Computing Subset Vertex Covers in $H$-Free Graphs

Dani\"el Paulusma, Erik Jan van Leeuwen, Jelle J. Oostveen, Johannes Rauch, Nick Brettell, Sukanya Pandey

arxiv:2307.05701 v2 · 2023-07-11 · math.CO · cs.CC · 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{VFK4RVYAXGMNGXP3TRBYRLU4IW}

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	2026-07-05T09:57:18.332649Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a955c8d700b998d35dfb9c4388ae9c4583564e691c893d241559e5dfb92b4bea

Aliases

arxiv: 2307.05701 · arxiv_version: 2307.05701v2 · doi: 10.48550/arxiv.2307.05701 · pith_short_12: VFK4RVYAXGMN · pith_short_16: VFK4RVYAXGMNGXP3 · pith_short_8: VFK4RVYA

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/VFK4RVYAXGMNGXP3TRBYRLU4IW \
  | 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: a955c8d700b998d35dfb9c4388ae9c4583564e691c893d241559e5dfb92b4bea

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9c3dfd41efdea6af6194b3eef27b8fb14d9f661f611bc313b5aa2cd1f0e6abae",
    "cross_cats_sorted": [
      "cs.CC",
      "cs.DM",
      "cs.DS"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2023-07-11T18:08:02Z",
    "title_canon_sha256": "224d66d2e276361b01092aeb7b51bed27695668da26e4b6ad552e20318b43744"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2307.05701",
    "kind": "arxiv",
    "version": 2
  }
}