Pith Number

pith:4JCEQ6RB

pith:2009:4JCEQ6RB7OQELJDENA3TXUL4CZ

not attested not anchored not stored refs pending

Shrinkage Algorithms for MMSE Covariance Estimation

Alfred O. Hero III, Ami Wiesel, Yilun Chen, Yonina C. Eldar

arxiv:0907.4698 v1 · 2009-07-27 · stat.ME · stat.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4JCEQ6RB7OQELJDENA3TXUL4CZ}

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	2026-05-18T02:12:47.444901Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e244487a21fba045a46468373bd17c16601b123b8099673a2b3caeee2cf9f6a3

Aliases

arxiv: 0907.4698 · arxiv_version: 0907.4698v1 · doi: 10.48550/arxiv.0907.4698 · pith_short_12: 4JCEQ6RB7OQE · pith_short_16: 4JCEQ6RB7OQELJDE · pith_short_8: 4JCEQ6RB

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/4JCEQ6RB7OQELJDENA3TXUL4CZ \
  | 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: e244487a21fba045a46468373bd17c16601b123b8099673a2b3caeee2cf9f6a3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f9f570e643a9f1b31a4561ebec07cf91d741a8539ef7a2ab5e1b66f02985428b",
    "cross_cats_sorted": [
      "stat.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "stat.ME",
    "submitted_at": "2009-07-27T16:42:53Z",
    "title_canon_sha256": "c0af94915a31883d1203aacd082b4fbdcbe0525e78fcc2fea4bd97c4e1b7afe2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0907.4698",
    "kind": "arxiv",
    "version": 1
  }
}