Pith Number

pith:CKZDAE5V

pith:2012:CKZDAE5V5NEIWVJMAYOMQXQ2TP

not attested not anchored not stored refs pending

Positive Definite $\ell_1$ Penalized Estimation of Large Covariance Matrices

Hui Zou, Lingzhou Xue, Shiqian Ma

arxiv:1208.5702 v1 · 2012-08-28 · stat.ME · math.OC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{CKZDAE5V5NEIWVJMAYOMQXQ2TP}

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	2026-05-18T03:46:57.973676Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

12b23013b5eb488b552c061cc85e1a9bca6913220b33582e02a75b19107e6151

Aliases

arxiv: 1208.5702 · arxiv_version: 1208.5702v1 · doi: 10.48550/arxiv.1208.5702 · pith_short_12: CKZDAE5V5NEI · pith_short_16: CKZDAE5V5NEIWVJM · pith_short_8: CKZDAE5V

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/CKZDAE5V5NEIWVJMAYOMQXQ2TP \
  | 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: 12b23013b5eb488b552c061cc85e1a9bca6913220b33582e02a75b19107e6151

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b3d19a72ce6c63bf4e2f5b05e2a2598e812a376590e7fa9c36027ff60a852a3f",
    "cross_cats_sorted": [
      "math.OC"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "stat.ME",
    "submitted_at": "2012-08-28T16:21:06Z",
    "title_canon_sha256": "25ba8835a9f39c644c5a9488bf681adca22e328afd2572c8c791970d86c34ed6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1208.5702",
    "kind": "arxiv",
    "version": 1
  }
}