Pith Number

pith:ZUINTOFC

pith:2009:ZUINTOFCS5SXLUT7OGBSEQDCUG

not attested not anchored not stored refs pending

Canonical Coordinates and Principal Directions for Surfaces in $\H^2\times\R$

Ana Irina Nistor, Franki Dillen, Marian Ioan Munteanu

arxiv:0910.2135 v2 · 2009-10-12 · 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{ZUINTOFCS5SXLUT7OGBSEQDCUG}

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	2026-05-18T04:04:07.081651Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

cd10d9b8a2976575d27f7183224062a1ae63c2dba5f4620d6569be1120770756

Aliases

arxiv: 0910.2135 · arxiv_version: 0910.2135v2 · doi: 10.48550/arxiv.0910.2135 · pith_short_12: ZUINTOFCS5SX · pith_short_16: ZUINTOFCS5SXLUT7 · pith_short_8: ZUINTOFC

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/ZUINTOFCS5SXLUT7OGBSEQDCUG \
  | 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: cd10d9b8a2976575d27f7183224062a1ae63c2dba5f4620d6569be1120770756

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "387ac9442dd284c815ba3fd12875ce1429f9ed8ef2f4282110eb86b03bf894cc",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.DG",
    "submitted_at": "2009-10-12T11:14:47Z",
    "title_canon_sha256": "d211eaed759f3138f35ec196827dbc2aa26b18a63bb4e0bb9276527ca932c9fc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0910.2135",
    "kind": "arxiv",
    "version": 2
  }
}