Pith Number

pith:QN2KMAYY

pith:2020:QN2KMAYY6SNJVKZVLGKP2BH6CE

not attested not anchored not stored refs pending

W[1]-Hardness of the k-Center Problem Parameterized by the Skeleton Dimension

Johannes Blum

arxiv:2008.07252 v1 · 2020-08-17 · 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{QN2KMAYY6SNJVKZVLGKP2BH6CE}

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	2026-07-05T01:27:37.912684Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8374a60318f49a9aab355994fd04fe111acf049dee8d74f991776c9842f47f65

Aliases

arxiv: 2008.07252 · arxiv_version: 2008.07252v1 · doi: 10.48550/arxiv.2008.07252 · pith_short_12: QN2KMAYY6SNJ · pith_short_16: QN2KMAYY6SNJVKZV · pith_short_8: QN2KMAYY

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/QN2KMAYY6SNJVKZVLGKP2BH6CE \
  | 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: 8374a60318f49a9aab355994fd04fe111acf049dee8d74f991776c9842f47f65

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0d4dc97a3f456d3eaa0701cf7f2037e9d68070775333fa2db5f0f3950d2057b6",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CC",
    "submitted_at": "2020-08-17T12:27:14Z",
    "title_canon_sha256": "bce9ff5aae51d5ce045eae9c17a4cef4e91b807b940f19293870f7fd599d4a03"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2008.07252",
    "kind": "arxiv",
    "version": 1
  }
}