Pith Number

pith:72DI5WF3

pith:2015:72DI5WF3HBWKJRNJ7UXM7QMXRU

not attested not anchored not stored refs pending

Combinatorial approximation of maximum $k$-vertex cover in bipartite graphs within ratio~0.7

Vangelis Th. Paschos

arxiv:1502.07930 v2 · 2015-02-27 · 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{72DI5WF3HBWKJRNJ7UXM7QMXRU}

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	2026-05-18T02:25:18.098470Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fe868ed8bb386ca4c5a9fd2ecfc1978d0cc1a236c7e6e3a65b3e52952acda136

Aliases

arxiv: 1502.07930 · arxiv_version: 1502.07930v2 · doi: 10.48550/arxiv.1502.07930 · pith_short_12: 72DI5WF3HBWK · pith_short_16: 72DI5WF3HBWKJRNJ · pith_short_8: 72DI5WF3

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/72DI5WF3HBWKJRNJ7UXM7QMXRU \
  | 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: fe868ed8bb386ca4c5a9fd2ecfc1978d0cc1a236c7e6e3a65b3e52952acda136

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6dd4de8d01a161b0a411a0c258d56572c3af64d63e4f4fd4a469283011ac23bb",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2015-02-27T15:19:46Z",
    "title_canon_sha256": "14cc014935b670bdef91199f5ed1f66b217c467b37cd976f380f9ef01ad54798"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1502.07930",
    "kind": "arxiv",
    "version": 2
  }
}