Pith Number

pith:PKEJ26BW

pith:2005:PKEJ26BWSQ7HCFICDK63YGOD5U

not attested not anchored not stored refs pending

The reverse greedy algorithm for the metric k-median problem

Claire Kenyon, Marek Chrobak, Neal E. Young

arxiv:cs/0504104 v2 · 2005-04-27 · 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{PKEJ26BWSQ7HCFICDK63YGOD5U}

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	2026-05-18T01:59:53.860952Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7a889d7836943e7115021abdbc19c3ed202529aeeda8400337cdb01b14ac0857

Aliases

arxiv: cs/0504104 · arxiv_version: cs/0504104v2 · doi: 10.48550/arxiv.cs/0504104 · pith_short_12: PKEJ26BWSQ7H · pith_short_16: PKEJ26BWSQ7HCFIC · pith_short_8: PKEJ26BW

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/PKEJ26BWSQ7HCFICDK63YGOD5U \
  | 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: 7a889d7836943e7115021abdbc19c3ed202529aeeda8400337cdb01b14ac0857

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d7724686bbc21657c1d760b14b18ae0f44842f5ebe3df2a9c91ba2eaf0861d2b",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "cs.DS",
    "submitted_at": "2005-04-27T19:36:08Z",
    "title_canon_sha256": "e2c5a8ad4d0d269c2e1a269d3aff53e7bdf1d83d5a49828eaa532fa3104489d0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "cs/0504104",
    "kind": "arxiv",
    "version": 2
  }
}