Pith Number

pith:CAUW6NN3

pith:2014:CAUW6NN3PYVR4KV4GWR6KQFX72

not attested not anchored not stored refs pending

Noise Estimation in the Spiked Covariance Model

Didier Ch\'etelat, Martin T. Wells

arxiv:1408.6440 v1 · 2014-08-27 · math.ST · stat.ME · 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{CAUW6NN3PYVR4KV4GWR6KQFX72}

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	2026-05-18T02:44:07.508927Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

10296f35bb7e2b1e2abc35a3e540b7fe98cb56190a2aa656f07fb78692d02579

Aliases

arxiv: 1408.6440 · arxiv_version: 1408.6440v1 · doi: 10.48550/arxiv.1408.6440 · pith_short_12: CAUW6NN3PYVR · pith_short_16: CAUW6NN3PYVR4KV4 · pith_short_8: CAUW6NN3

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/CAUW6NN3PYVR4KV4GWR6KQFX72 \
  | 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: 10296f35bb7e2b1e2abc35a3e540b7fe98cb56190a2aa656f07fb78692d02579

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2ff5b959f8356e149d522351a3772f28e0f263299361dd3dd8e0aa8c7ee192ee",
    "cross_cats_sorted": [
      "stat.ME",
      "stat.TH"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.ST",
    "submitted_at": "2014-08-27T15:41:48Z",
    "title_canon_sha256": "656efc909267a6ecfc2cdab4ec8b595dc5ed199de7189ce4feeee854fac69c4f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1408.6440",
    "kind": "arxiv",
    "version": 1
  }
}