Pith Number

pith:PPOEXQFJ

pith:2013:PPOEXQFJTNQADI5L3SVOGAXJPB

not attested not anchored not stored refs pending

A Kernel Classification Framework for Metric Learning

David Zhang, Deyu Meng, Faqiang Wang, Lei Zhang, Wangmeng Zuo

arxiv:1309.5823 v1 · 2013-09-23 · cs.LG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{PPOEXQFJTNQADI5L3SVOGAXJPB}

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	2026-05-18T03:12:34.027402Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7bdc4bc0a99b6001a3abdcaae302e9786639e39f3f3c9d2a7e815faf989be65c

Aliases

arxiv: 1309.5823 · arxiv_version: 1309.5823v1 · doi: 10.48550/arxiv.1309.5823 · pith_short_12: PPOEXQFJTNQA · pith_short_16: PPOEXQFJTNQADI5L · pith_short_8: PPOEXQFJ

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/PPOEXQFJTNQADI5L3SVOGAXJPB \
  | 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: 7bdc4bc0a99b6001a3abdcaae302e9786639e39f3f3c9d2a7e815faf989be65c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a8637d59ea0ea6918a0d44b65f2c9345000989400663eb42558f9a6300edcfa6",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LG",
    "submitted_at": "2013-09-23T14:39:48Z",
    "title_canon_sha256": "d1d132c195cd8a4c9c63055433774f1aef77acdf8df13aa99172bb14c46e5b25"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1309.5823",
    "kind": "arxiv",
    "version": 1
  }
}