Pith Number

pith:RUY4VBRU

pith:2007:RUY4VBRUUF6MAHMPUYQ2YPIGPE

not attested not anchored not stored refs pending

On the Area Functional of the Second Fundamental Form of Ovaloids

Steven Verpoort

arxiv:0709.1644 v3 · 2007-09-11 · math.DG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{RUY4VBRUUF6MAHMPUYQ2YPIGPE}

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	2026-07-04T15:50:10.898729Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8d31ca8634a17cc01d8fa621ac3d06792599eb5f3f55f1d97135911221c1b7a5

Aliases

arxiv: 0709.1644 · arxiv_version: 0709.1644v3 · doi: 10.48550/arxiv.0709.1644 · pith_short_12: RUY4VBRUUF6M · pith_short_16: RUY4VBRUUF6MAHMP · pith_short_8: RUY4VBRU

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/RUY4VBRUUF6MAHMPUYQ2YPIGPE \
  | 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: 8d31ca8634a17cc01d8fa621ac3d06792599eb5f3f55f1d97135911221c1b7a5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b5527dc9d2172b8d1f3b60a7a19118e9d853e1138447ea130a1fe5d24de4eecd",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.DG",
    "submitted_at": "2007-09-11T14:58:55Z",
    "title_canon_sha256": "233d8116bd899fa574032e3243db8cf4ef00713d8e7f6f0f1004efd2c23e210a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0709.1644",
    "kind": "arxiv",
    "version": 3
  }
}