Pith Number

pith:FA5HXE7H

pith:2015:FA5HXE7HH475ZEKD4W6GH3OPWB

not attested not anchored not stored refs pending

A PTAS for the Weighted Unit Disk Cover Problem

Jian Li, Yifei Jin

arxiv:1502.04918 v3 · 2015-02-17 · cs.CG

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{FA5HXE7HH475ZEKD4W6GH3OPWB}

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	2026-05-18T01:23:04.235159Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

283a7b93e73f3fdc9143e5bc63edcfb0525f4fe8301c3402c180be5f831dae75

Aliases

arxiv: 1502.04918 · arxiv_version: 1502.04918v3 · doi: 10.48550/arxiv.1502.04918 · pith_short_12: FA5HXE7HH475 · pith_short_16: FA5HXE7HH475ZEKD · pith_short_8: FA5HXE7H

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/FA5HXE7HH475ZEKD4W6GH3OPWB \
  | 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: 283a7b93e73f3fdc9143e5bc63edcfb0525f4fe8301c3402c180be5f831dae75

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7491cfce47cc2977643aca547cb76568a611f2cd28afef46e9efb0cec8d2bc6e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CG",
    "submitted_at": "2015-02-17T15:18:40Z",
    "title_canon_sha256": "07589013d7f207838c6d59e3425c2693b44a3135fb3653a09ba8cafaa98a003a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1502.04918",
    "kind": "arxiv",
    "version": 3
  }
}