Pith Number

pith:TP5DHD5Y

pith:2021:TP5DHD5YM6D2JGCMLN6Z33SLGI

not attested not anchored not stored refs pending

Anti-Factor is FPT Parameterized by Treewidth and List Size (but Counting is Hard)

D\'aniel Marx, Govind S. Sankar, Philipp Schepper

arxiv:2110.09369 v2 · 2021-10-18 · cs.CC · 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{TP5DHD5YM6D2JGCMLN6Z33SLGI}

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	2026-07-05T05:39:11.126749Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9bfa338fb86787a4984c5b7d9dee4b32026eb4ab63f2f9c289f6dfbf2caada86

Aliases

arxiv: 2110.09369 · arxiv_version: 2110.09369v2 · doi: 10.48550/arxiv.2110.09369 · pith_short_12: TP5DHD5YM6D2 · pith_short_16: TP5DHD5YM6D2JGCM · pith_short_8: TP5DHD5Y

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/TP5DHD5YM6D2JGCMLN6Z33SLGI \
  | 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: 9bfa338fb86787a4984c5b7d9dee4b32026eb4ab63f2f9c289f6dfbf2caada86

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "499d376d5296c9be0f1bb8ec5e7fb144942bd528ab7ad352ea9e2caee707bc37",
    "cross_cats_sorted": [
      "cs.DS"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2021-10-18T14:53:45Z",
    "title_canon_sha256": "7ba418401a9d7f1b589a6d9ede14c89b1829c86ff95c0ed9a767e600800e95a7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2110.09369",
    "kind": "arxiv",
    "version": 2
  }
}