Pith Number

pith:5ISWBW6E

pith:2019:5ISWBW6E4G5ZDDSOT7UETRTAZN

not attested not anchored not stored refs pending

On the Structure of Small Strength-$2$ Covering Arrays

Brett Stevens, Janne I. Kokkala, Karen Meagher, Kari J. Nurmela, Patric R. J. \"Osterg{\aa}rd, Reza Naserasr

arxiv:1901.03594 v2 · 2019-01-11 · math.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{5ISWBW6E4G5ZDDSOT7UETRTAZN}

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	2026-05-17T23:42:02.620249Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ea2560dbc4e1bb918e4e9fe849c660cb660283d59b100f8a359da5cea40fa6fb

Aliases

arxiv: 1901.03594 · arxiv_version: 1901.03594v2 · doi: 10.48550/arxiv.1901.03594 · pith_short_12: 5ISWBW6E4G5Z · pith_short_16: 5ISWBW6E4G5ZDDSO · pith_short_8: 5ISWBW6E

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/5ISWBW6E4G5ZDDSOT7UETRTAZN \
  | 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: ea2560dbc4e1bb918e4e9fe849c660cb660283d59b100f8a359da5cea40fa6fb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "acaa96c0fcd972508b2a598763a816f1a5093802bb09e6a99fa7ed9a3680bf87",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-sa/4.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2019-01-11T14:30:24Z",
    "title_canon_sha256": "c05fc34204223c39f35518e0ca157ae5a8853274398f7d45f40ca2b53b3b5404"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1901.03594",
    "kind": "arxiv",
    "version": 2
  }
}