Pith Number

pith:3R7V5ZXC

pith:2011:3R7V5ZXCHRA7SLXH2HZASSYRSX

not attested not anchored not stored refs pending

A Problem Concerning Nonincident Points and Lines in Projective Planes

Douglas R. Stinson

arxiv:1109.1573 v2 · 2011-09-07 · 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{3R7V5ZXCHRA7SLXH2HZASSYRSX}

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	2026-05-18T04:12:54.264278Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

dc7f5ee6e23c41f92ee7d1f2094b1195e5110f1493e62623574ded04c9cd9f01

Aliases

arxiv: 1109.1573 · arxiv_version: 1109.1573v2 · doi: 10.48550/arxiv.1109.1573 · pith_short_12: 3R7V5ZXCHRA7 · pith_short_16: 3R7V5ZXCHRA7SLXH · pith_short_8: 3R7V5ZXC

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/3R7V5ZXCHRA7SLXH2HZASSYRSX \
  | 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: dc7f5ee6e23c41f92ee7d1f2094b1195e5110f1493e62623574ded04c9cd9f01

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d7dab00612e21994044e217a7c37a7830f6e4393ff17aa97433fcc19a0687497",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2011-09-07T20:28:08Z",
    "title_canon_sha256": "4085b889ee443da930ee3bbfa6003bae59c06eb6fd41d6bac4f0176896c45f5f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1109.1573",
    "kind": "arxiv",
    "version": 2
  }
}