Pith Number

pith:2UURDK6D

pith:2013:2UURDK6DKFQAXQVVQ2SNIDQCHB

not attested not anchored not stored refs pending

Online Vertex Cover and Matching: Beating the Greedy Algorithm

Sam Chiu-wai Wong, Yajun Wang

arxiv:1305.1694 v1 · 2013-05-08 · 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{2UURDK6DKFQAXQVVQ2SNIDQCHB}

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	2026-05-18T03:26:11.518984Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d52911abc351600bc2b586a4d40e02387c5aec4b97d6f0a22e0a05712a47a1af

Aliases

arxiv: 1305.1694 · arxiv_version: 1305.1694v1 · doi: 10.48550/arxiv.1305.1694 · pith_short_12: 2UURDK6DKFQA · pith_short_16: 2UURDK6DKFQAXQVV · pith_short_8: 2UURDK6D

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/2UURDK6DKFQAXQVVQ2SNIDQCHB \
  | 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: d52911abc351600bc2b586a4d40e02387c5aec4b97d6f0a22e0a05712a47a1af

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2970f7e8ae1cd9117b9b28459fd8c2c4448ecc2602e8b7d2d2aec95cebdfffeb",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2013-05-08T02:18:28Z",
    "title_canon_sha256": "3d4a0e8cf3ccf381ac5fe76f86d891f02fc6c07530e1bd260c21d11e5d01967e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1305.1694",
    "kind": "arxiv",
    "version": 1
  }
}