Pith Number

pith:DYPJ2XY4

pith:2018:DYPJ2XY4Z44GH3KA3X3E7YTHE7

not attested not anchored not stored refs pending

Constructions of optimal orthogonal arrays with repeated rows

Charles J. Colbourn, Douglas R. Stinson, Shannon Veitch

arxiv:1812.05147 v1 · 2018-12-12 · 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{DYPJ2XY4Z44GH3KA3X3E7YTHE7}

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	2026-05-17T23:58:24.386210Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1e1e9d5f1ccf3863ed40ddf64fe26727eabcf0cd5ab224c08675342f7ee91358

Aliases

arxiv: 1812.05147 · arxiv_version: 1812.05147v1 · doi: 10.48550/arxiv.1812.05147 · pith_short_12: DYPJ2XY4Z44G · pith_short_16: DYPJ2XY4Z44GH3KA · pith_short_8: DYPJ2XY4

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/DYPJ2XY4Z44GH3KA3X3E7YTHE7 \
  | 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: 1e1e9d5f1ccf3863ed40ddf64fe26727eabcf0cd5ab224c08675342f7ee91358

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8cdc3e705b1df751dcf933a46071f52bc2a7a8ff2d694d3ac492dc7abcb239bf",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2018-12-12T20:21:58Z",
    "title_canon_sha256": "8b65f1fff91f8b448b6b7b9241dd8757f19fb144008329870a5e712030a4ed97"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1812.05147",
    "kind": "arxiv",
    "version": 1
  }
}