Pith Number

pith:I5KLKAC6

pith:2009:I5KLKAC6QW57RBTNFEXFAYXZK2

not attested not anchored not stored refs pending

A Weakly-Robust PTAS for Minimum Clique Partition in Unit Disk Graphs

Canada), Edmonton, Imran A. Pirwani (1), Mohammad R. Salavatipour (1) ((1) Department of Computing Science, University of Alberta

arxiv:0904.2203 v2 · 2009-04-14 · cs.CG · cs.DC · 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{I5KLKAC6QW57RBTNFEXFAYXZK2}

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	2026-05-18T02:14:00.456458Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4754b5005e85bbf8866d292e5062f956a612556663c72e2a36b8b8727e78c696

Aliases

arxiv: 0904.2203 · arxiv_version: 0904.2203v2 · doi: 10.48550/arxiv.0904.2203 · pith_short_12: I5KLKAC6QW57 · pith_short_16: I5KLKAC6QW57RBTN · pith_short_8: I5KLKAC6

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/I5KLKAC6QW57RBTNFEXFAYXZK2 \
  | 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: 4754b5005e85bbf8866d292e5062f956a612556663c72e2a36b8b8727e78c696

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0f330de680c12fdd33098145de046ac1bdb57cb46acf1fe0aeace485215ebd9c",
    "cross_cats_sorted": [
      "cs.DC",
      "cs.DM",
      "cs.DS"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CG",
    "submitted_at": "2009-04-14T20:44:57Z",
    "title_canon_sha256": "8815f0525c67740f1d52bf19f44fb54cc16cca6d8e367020702fb05f3fd3c718"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.2203",
    "kind": "arxiv",
    "version": 2
  }
}