Pith Number

pith:WL2W3LHB

pith:2010:WL2W3LHBZSSDZGFXERTBZW3P3U

not attested not anchored not stored refs pending

W[1]-hardness of some domination-like problems parameterized by tree-width

Mathieu Chapelle

arxiv:1004.2642 v6 · 2010-04-15 · cs.CC · 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{WL2W3LHBZSSDZGFXERTBZW3P3U}

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	2026-05-18T02:54:56.722973Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b2f56dace1cca43c98b724661cdb6fdd268ec2c706a72fc01a0f61f04179e9b3

Aliases

arxiv: 1004.2642 · arxiv_version: 1004.2642v6 · doi: 10.48550/arxiv.1004.2642 · pith_short_12: WL2W3LHBZSSD · pith_short_16: WL2W3LHBZSSDZGFX · pith_short_8: WL2W3LHB

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/WL2W3LHBZSSDZGFXERTBZW3P3U \
  | 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: b2f56dace1cca43c98b724661cdb6fdd268ec2c706a72fc01a0f61f04179e9b3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5103480276955697c48e32d8fb89bf6e7ae5a92b268d0f332c41406578126dbc",
    "cross_cats_sorted": [
      "cs.DM"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2010-04-15T14:49:00Z",
    "title_canon_sha256": "2725cbac04fd7da5af28c5b454eaeca2b1938a4a70d7ebda751059550a8346a4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1004.2642",
    "kind": "arxiv",
    "version": 6
  }
}