Pith Number

pith:7QIMR6UX

pith:2015:7QIMR6UXH3I4NOX6JVHTS5IY7N

not attested not anchored not stored refs pending

A geometric characterisation of Desarguesian spreads

John Sheekey, Sara Rottey

arxiv:1504.01915 v3 · 2015-04-08 · 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{7QIMR6UXH3I4NOX6JVHTS5IY7N}

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	2026-05-18T00:49:08.730303Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fc10c8fa973ed1c6bafe4d4f397518fb56041394224603dfff482b8aa00356e2

Aliases

arxiv: 1504.01915 · arxiv_version: 1504.01915v3 · doi: 10.48550/arxiv.1504.01915 · pith_short_12: 7QIMR6UXH3I4 · pith_short_16: 7QIMR6UXH3I4NOX6 · pith_short_8: 7QIMR6UX

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/7QIMR6UXH3I4NOX6JVHTS5IY7N \
  | 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: fc10c8fa973ed1c6bafe4d4f397518fb56041394224603dfff482b8aa00356e2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f88fce32d03d9dc43642fe43ae39904b14a7688efda97b25dabcb2cca305f70a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2015-04-08T11:13:01Z",
    "title_canon_sha256": "7dc028cd21f7497e249a02d569304889b78c3c544417b92f3a8f1d74472eb73f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1504.01915",
    "kind": "arxiv",
    "version": 3
  }
}