Pith Number

pith:AGQRZ6YI

pith:2013:AGQRZ6YIZTQVAZIGJXBGDW7UEL

not attested not anchored not stored refs pending

On the Strong Convergence of the Optimal Linear Shrinkage Estimator for Large Dimensional Covariance Matrix

Arjun K. Gupta, Nestor Parolya, Taras Bodnar

arxiv:1308.2608 v2 · 2013-08-12 · math.ST · math.PR · q-fin.ST · stat.TH

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{AGQRZ6YIZTQVAZIGJXBGDW7UEL}

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	2026-05-18T02:39:24.083686Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

01a11cfb08cce15065064dc261dbf422c36f0d4c64ea8ae06634c7cf2a696fa1

Aliases

arxiv: 1308.2608 · arxiv_version: 1308.2608v2 · doi: 10.48550/arxiv.1308.2608 · pith_short_12: AGQRZ6YIZTQV · pith_short_16: AGQRZ6YIZTQVAZIG · pith_short_8: AGQRZ6YI

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/AGQRZ6YIZTQVAZIGJXBGDW7UEL \
  | 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: 01a11cfb08cce15065064dc261dbf422c36f0d4c64ea8ae06634c7cf2a696fa1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "66067ba46a2f3c239a32302c1002356de6f01dd77e76bbf1a66d602e12da0af4",
    "cross_cats_sorted": [
      "math.PR",
      "q-fin.ST",
      "stat.TH"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.ST",
    "submitted_at": "2013-08-12T16:11:44Z",
    "title_canon_sha256": "75b0f353fd5fc14075b956423c563921277989eee8f75249c286787f0969c185"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1308.2608",
    "kind": "arxiv",
    "version": 2
  }
}