Pith Number

pith:XDNWG547

pith:2013:XDNWG547LOJVYLFHBKK2JV2VKQ

not attested not anchored not stored refs pending

Combinatorial constructions for optimal two-dimensional optical orthogonal codes with $\lambda$ = 2

Tao Feng, Yanxun Chang

arxiv:1312.7589 v1 · 2013-12-29 · 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{XDNWG547LOJVYLFHBKK2JV2VKQ}

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	2026-05-18T03:03:34.307490Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b8db63779f5b935c2ca70a95a4d755543391637900e5dd27a8067ffd1b3fac16

Aliases

arxiv: 1312.7589 · arxiv_version: 1312.7589v1 · doi: 10.48550/arxiv.1312.7589 · pith_short_12: XDNWG547LOJV · pith_short_16: XDNWG547LOJVYLFH · pith_short_8: XDNWG547

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/XDNWG547LOJVYLFHBKK2JV2VKQ \
  | 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: b8db63779f5b935c2ca70a95a4d755543391637900e5dd27a8067ffd1b3fac16

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3b1d211ef7800c54f5069e2cce022a024f98bda93495a245d5506681e507ee08",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2013-12-29T21:01:39Z",
    "title_canon_sha256": "33ffce64ba4f2d5adaa6c553ec8ecd1aa4ffd7363f40bf3fc57674ddba63e4ad"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1312.7589",
    "kind": "arxiv",
    "version": 1
  }
}