Pith Number

pith:QHE3JE6V

pith:2015:QHE3JE6VM2JOPZY6LNFK33SMQA

not attested not anchored not stored refs pending

A very special EPW sextic and two IHS fourfolds

Bert van Geemen, Grzegorz Kapustka, Jaros{\l}aw A. Wi\'sniewski, Maria Donten-Bury, Micha{\l} Kapustka

arxiv:1509.06214 v2 · 2015-09-21 · 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{QHE3JE6VM2JOPZY6LNFK33SMQA}

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	2026-05-18T00:47:51.180744Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

81c9b493d56692e7e71e5b4aadee4c802fe062e6f043485db0a2eaa55529f60a

Aliases

arxiv: 1509.06214 · arxiv_version: 1509.06214v2 · doi: 10.48550/arxiv.1509.06214 · pith_short_12: QHE3JE6VM2JO · pith_short_16: QHE3JE6VM2JOPZY6 · pith_short_8: QHE3JE6V

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/QHE3JE6VM2JOPZY6LNFK33SMQA \
  | 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: 81c9b493d56692e7e71e5b4aadee4c802fe062e6f043485db0a2eaa55529f60a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "935181c346b758de135764f0772e6bab607c983f61818d1852913c267ec18f60",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2015-09-21T13:07:30Z",
    "title_canon_sha256": "0536e57e7e5cd7eaf0ee34de53d59e34de4bb9bbfdb57029219fc970c706dc85"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1509.06214",
    "kind": "arxiv",
    "version": 2
  }
}