Pith Number

pith:3TZNHHYS

pith:2013:3TZNHHYSHWCLEAI2TVRCOVJJ3H

not attested not anchored not stored refs pending

A O(c^k n) 5-Approximation Algorithm for Treewidth

Daniel Lokshtanov, Fedor V. Fomin, Hans Bodlaender, Markus S. Dregi, Micha{\l} Pilipczuk, P{\aa}l G. Drange

arxiv:1304.6321 v1 · 2013-04-23 · cs.DS · 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{3TZNHHYSHWCLEAI2TVRCOVJJ3H}

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	2026-05-18T03:27:21.829030Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

dcf2d39f123d84b2011a9d62275529d9e6212c79c5c25cb5d22305fc3c48fab3

Aliases

arxiv: 1304.6321 · arxiv_version: 1304.6321v1 · doi: 10.48550/arxiv.1304.6321 · pith_short_12: 3TZNHHYSHWCL · pith_short_16: 3TZNHHYSHWCLEAI2 · pith_short_8: 3TZNHHYS

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/3TZNHHYSHWCLEAI2TVRCOVJJ3H \
  | 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: dcf2d39f123d84b2011a9d62275529d9e6212c79c5c25cb5d22305fc3c48fab3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fbe839185908d5f8c2cf8466574283cc0eca033171328eb568bc7bb97c28265a",
    "cross_cats_sorted": [
      "cs.DM"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2013-04-23T15:29:55Z",
    "title_canon_sha256": "37f65fcdb6ef86b0d1b93f17a2a27b1a267780985434ab9a383c6099b3300bc2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1304.6321",
    "kind": "arxiv",
    "version": 1
  }
}