Pith Number

pith:TGEVC73W

pith:2009:TGEVC73WFON55SNVACK5WY7BIY

not attested not anchored not stored refs pending

A note on Fano surfaces of nodal cubic threefolds

Alexis Kouvidakis, Gerard van der Geer

arxiv:0902.3877 v1 · 2009-02-23 · 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{TGEVC73WFON55SNVACK5WY7BIY}

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	2026-05-18T04:39:39.356029Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9989517f762b9bdec9b50095db63e1462d037adf12e0936c8804c52abbc2c6ca

Aliases

arxiv: 0902.3877 · arxiv_version: 0902.3877v1 · doi: 10.48550/arxiv.0902.3877 · pith_short_12: TGEVC73WFON5 · pith_short_16: TGEVC73WFON55SNV · pith_short_8: TGEVC73W

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/TGEVC73WFON55SNVACK5WY7BIY \
  | 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: 9989517f762b9bdec9b50095db63e1462d037adf12e0936c8804c52abbc2c6ca

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "469d304666f3dccbeccbeb4b4a0ee14c6269c80d46886f5283cacd412101d9a7",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2009-02-23T10:15:57Z",
    "title_canon_sha256": "11a49d5908d8cb5eccf8bb1e6d8b6b9afec1bc73ab205dee0efc60eaca50ff9d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0902.3877",
    "kind": "arxiv",
    "version": 1
  }
}