Pith Number

pith:JU5NNK5O

pith:2013:JU5NNK5OQMRLMEKFVGV6GM45XY

not attested not anchored not stored refs pending

A Near Optimal Approximation Algorithm for Vertex-Cover Problem

Deepak Puthal

arxiv:1309.4953 v1 · 2013-09-19 · 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{JU5NNK5OQMRLMEKFVGV6GM45XY}

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	2026-05-18T03:12:49.213609Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4d3ad6abae8322b61145a9abe3339dbe3b76a1fc7da391e9377526432291911c

Aliases

arxiv: 1309.4953 · arxiv_version: 1309.4953v1 · doi: 10.48550/arxiv.1309.4953 · pith_short_12: JU5NNK5OQMRL · pith_short_16: JU5NNK5OQMRLMEKF · pith_short_8: JU5NNK5O

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/JU5NNK5OQMRLMEKFVGV6GM45XY \
  | 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: 4d3ad6abae8322b61145a9abe3339dbe3b76a1fc7da391e9377526432291911c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c173ded99a6b973f765ccc3f85274e5a020b509fcac7a57ad630806608c2070b",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/3.0/",
    "primary_cat": "cs.DS",
    "submitted_at": "2013-09-19T12:27:27Z",
    "title_canon_sha256": "0b778dd177524b1ec42160c120993eb45861fc5a4872259b1648be9b4767d950"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1309.4953",
    "kind": "arxiv",
    "version": 1
  }
}