Pith Number

pith:EFPPCA4O

pith:2017:EFPPCA4ODS5RPOGMGHB3V4RW3K

not attested not anchored not stored refs pending

La notion d'involution dans le Brouillon Project de Girard Desargues

Jean-Yves Briend, Marie Anglade

arxiv:1707.05494 v1 · 2017-07-18 · math.HO · math.AG

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{EFPPCA4ODS5RPOGMGHB3V4RW3K}

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	2026-05-18T00:40:02.192004Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

215ef1038e1cbb17b8cc31c3baf236da9489ff58205b2051710efe54b438ccd1

Aliases

arxiv: 1707.05494 · arxiv_version: 1707.05494v1 · doi: 10.48550/arxiv.1707.05494 · pith_short_12: EFPPCA4ODS5R · pith_short_16: EFPPCA4ODS5RPOGM · pith_short_8: EFPPCA4O

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/EFPPCA4ODS5RPOGMGHB3V4RW3K \
  | 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: 215ef1038e1cbb17b8cc31c3baf236da9489ff58205b2051710efe54b438ccd1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a8121eb932356411f82bc7d6ac3e1bda802cc78fc90e30512d0b6d844ca11f75",
    "cross_cats_sorted": [
      "math.AG"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.HO",
    "submitted_at": "2017-07-18T06:42:53Z",
    "title_canon_sha256": "47fe5e8052632900f06de7ceae7995da30d2dce5238413f7188cc6d3830e16c6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1707.05494",
    "kind": "arxiv",
    "version": 1
  }
}