Pith Number

pith:CCIOKLJI

pith:2012:CCIOKLJIPJ2Q6RWEYISSMWSQYE

not attested not anchored not stored refs pending

The Intersection problem for 2-(v; 5; 1) directed block designs

Nasrin Soltankhah, somaye ahmadi

arxiv:1207.3400 v1 · 2012-07-14 · 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{CCIOKLJIPJ2Q6RWEYISSMWSQYE}

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	2026-05-18T03:51:01.282097Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1090e52d287a750f46c4c225265a50c10aea7cd3c6be8cad3a768254fd57fd2b

Aliases

arxiv: 1207.3400 · arxiv_version: 1207.3400v1 · doi: 10.48550/arxiv.1207.3400 · pith_short_12: CCIOKLJIPJ2Q · pith_short_16: CCIOKLJIPJ2Q6RWE · pith_short_8: CCIOKLJI

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/CCIOKLJIPJ2Q6RWEYISSMWSQYE \
  | 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: 1090e52d287a750f46c4c225265a50c10aea7cd3c6be8cad3a768254fd57fd2b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6aa3eca37559637078be003a5d0e2570bdc01ead91a0a1d7f7a9c134270f6ca0",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2012-07-14T07:15:40Z",
    "title_canon_sha256": "1d7853b6387d1b6fa2b2e0e61968626de2c725f1d17d08b169229892bad9788e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1207.3400",
    "kind": "arxiv",
    "version": 1
  }
}