Pith Number

pith:NHA2QGBE

pith:2011:NHA2QGBEWTODVL72YTYWOYU6UE

not attested not anchored not stored refs pending

Feature Selection via Sparse Approximation for Face Recognition

Beiji Zou, Lei Wang, Yao Xiang, Yixiong Liang

arxiv:1102.2748 v1 · 2011-02-14 · cs.CV · cs.AI

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{NHA2QGBEWTODVL72YTYWOYU6UE}

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	2026-05-18T04:28:46.566558Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

69c1a81824b4dc3aaffac4f167629ea12b431f488af92ef1ded540a3684f15ab

Aliases

arxiv: 1102.2748 · arxiv_version: 1102.2748v1 · doi: 10.48550/arxiv.1102.2748 · pith_short_12: NHA2QGBEWTOD · pith_short_16: NHA2QGBEWTODVL72 · pith_short_8: NHA2QGBE

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/NHA2QGBEWTODVL72YTYWOYU6UE \
  | 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: 69c1a81824b4dc3aaffac4f167629ea12b431f488af92ef1ded540a3684f15ab

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a1ac9e7aa0721c9415137a116c64e59fb57ce157f6e4ac5926f092a7fc140a35",
    "cross_cats_sorted": [
      "cs.AI"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CV",
    "submitted_at": "2011-02-14T12:05:47Z",
    "title_canon_sha256": "a61cd27445529bf0c9e67f4fdde819e81767858ef28ce5992b3b5ed233b8ae89"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1102.2748",
    "kind": "arxiv",
    "version": 1
  }
}