Pith Number

pith:V2NVBVME

pith:2015:V2NVBVMEHHJWPTAJIYCWPM6PVC

not attested not anchored not stored refs pending

Robust Estimation of Structured Covariance Matrix for Heavy-Tailed Elliptical Distributions

Daniel P. Palomar, Prabhu Babu, Ying Sun

arxiv:1506.05215 v1 · 2015-06-17 · stat.AP · stat.ML

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{V2NVBVMEHHJWPTAJIYCWPM6PVC}

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	2026-05-18T01:11:46.864876Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ae9b50d58439d367cc09460567b3cfa89384be177fdfce4b9a7cc923011514ca

Aliases

arxiv: 1506.05215 · arxiv_version: 1506.05215v1 · doi: 10.48550/arxiv.1506.05215 · pith_short_12: V2NVBVMEHHJW · pith_short_16: V2NVBVMEHHJWPTAJ · pith_short_8: V2NVBVME

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/V2NVBVMEHHJWPTAJIYCWPM6PVC \
  | 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: ae9b50d58439d367cc09460567b3cfa89384be177fdfce4b9a7cc923011514ca

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a6ac2efef9dd0b22e338d69e7973d5c0b762ab058b1671293fe4671c74803e5e",
    "cross_cats_sorted": [
      "stat.ML"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "stat.AP",
    "submitted_at": "2015-06-17T06:17:26Z",
    "title_canon_sha256": "cea5889c9cf50f205545d3cea41b3fdae1a6d2d344e0d517bc43ee4daadb264b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1506.05215",
    "kind": "arxiv",
    "version": 1
  }
}