Pith Number

pith:UUFSHWSQ

pith:2019:UUFSHWSQ5YZVHA3DZZ64KRBGSE

not attested not anchored not stored refs pending

A Simple Gap-producing Reduction for the Parameterized Set Cover Problem

Bingkai Lin

arxiv:1902.03702 v2 · 2019-02-11 · cs.CC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{UUFSHWSQ5YZVHA3DZZ64KRBGSE}

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	2026-05-17T23:47:43.811984Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a50b23da50ee33538363ce7dc5442691397f801881eb6c1887dbbbe680dd85f8

Aliases

arxiv: 1902.03702 · arxiv_version: 1902.03702v2 · doi: 10.48550/arxiv.1902.03702 · pith_short_12: UUFSHWSQ5YZV · pith_short_16: UUFSHWSQ5YZVHA3D · pith_short_8: UUFSHWSQ

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/UUFSHWSQ5YZVHA3DZZ64KRBGSE \
  | 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: a50b23da50ee33538363ce7dc5442691397f801881eb6c1887dbbbe680dd85f8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5bd4675faab217688eef84569bee4a37e520666bd01ff2e5fafcb8530bde7179",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2019-02-11T01:50:23Z",
    "title_canon_sha256": "f6d675790966110abd2393677b27be37c369ac21b3f8889f88380e50d173f387"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.03702",
    "kind": "arxiv",
    "version": 2
  }
}