Pith Number

pith:QYZJ4BO6

pith:2007:QYZJ4BO6X7TBLRLJKTVLP5PBU5

not attested not anchored not stored refs pending

Classification of free actions on complete intersections of four quadrics

Zheng Hua

arxiv:0707.4339 v2 · 2007-07-30 · 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{QYZJ4BO6X7TBLRLJKTVLP5PBU5}

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	2026-05-18T04:40:34.247582Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

86329e05debfe615c56954eab7f5e1a765716d755e1840993b1f3b0b68fd5373

Aliases

arxiv: 0707.4339 · arxiv_version: 0707.4339v2 · doi: 10.48550/arxiv.0707.4339 · pith_short_12: QYZJ4BO6X7TB · pith_short_16: QYZJ4BO6X7TBLRLJ · pith_short_8: QYZJ4BO6

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/QYZJ4BO6X7TBLRLJKTVLP5PBU5 \
  | 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: 86329e05debfe615c56954eab7f5e1a765716d755e1840993b1f3b0b68fd5373

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4d6ce8f9120f8ef218f727a441a3055edce1406d9eb0d9fbfdfc16bc2f998c36",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.AG",
    "submitted_at": "2007-07-30T05:42:39Z",
    "title_canon_sha256": "7a1a1aef1ad3ea06e83941c2bd3fe6bc24721132ea95d9b317f18508fdca269c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0707.4339",
    "kind": "arxiv",
    "version": 2
  }
}