Pith Number

pith:57Z73SBE

pith:2018:57Z73SBE3ROM246UHD5I3RNOMQ

not attested not anchored not stored refs pending

Rotational Surfaces with second fundamental form of constant length

Alexandre P. Barreto, Francisco Fontenele, Luiz Hartmann

arxiv:1812.08676 v1 · 2018-12-20 · math.DG · math.CA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{57Z73SBE3ROM246UHD5I3RNOMQ}

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	2026-05-17T23:57:49.399404Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

eff3fdc824dc5ccd73d438fa8dc5ae643ff47c3fe9b73af40d987f7a7a99dda0

Aliases

arxiv: 1812.08676 · arxiv_version: 1812.08676v1 · doi: 10.48550/arxiv.1812.08676 · pith_short_12: 57Z73SBE3ROM · pith_short_16: 57Z73SBE3ROM246U · pith_short_8: 57Z73SBE

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/57Z73SBE3ROM246UHD5I3RNOMQ \
  | 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: eff3fdc824dc5ccd73d438fa8dc5ae643ff47c3fe9b73af40d987f7a7a99dda0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f0f7cdeb10c73052cf2a589af1dd0493e7ac8292f6da24f0ecf7a3afc6282cac",
    "cross_cats_sorted": [
      "math.CA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.DG",
    "submitted_at": "2018-12-20T16:25:24Z",
    "title_canon_sha256": "bd3bf5314b2939687f8531debc9ef34a13e807e343e166b29abf6825e7d4f9e3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1812.08676",
    "kind": "arxiv",
    "version": 1
  }
}