Pith Number

pith:EBHUMRQ3

pith:2018:EBHUMRQ3RLSTME357X55NUBMTG

not attested not anchored not stored refs pending

Linear Shrinkage Estimation of Covariance Matrices Using Low-Complexity Cross-Validation

Jiangtao Xi, Jun Tong, Qinghua Guo, Rui Hu, Yanguang Yu, Zhitao Xiao

arxiv:1810.08360 v1 · 2018-10-19 · cs.IT · math.IT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{EBHUMRQ3RLSTME357X55NUBMTG}

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	2026-05-18T00:02:48.346260Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

204f46461b8ae536137dfdfbd6d02c999d65f2aad05db58e5af8c69f807d9278

Aliases

arxiv: 1810.08360 · arxiv_version: 1810.08360v1 · doi: 10.48550/arxiv.1810.08360 · pith_short_12: EBHUMRQ3RLST · pith_short_16: EBHUMRQ3RLSTME35 · pith_short_8: EBHUMRQ3

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/EBHUMRQ3RLSTME357X55NUBMTG \
  | 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: 204f46461b8ae536137dfdfbd6d02c999d65f2aad05db58e5af8c69f807d9278

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c247ee9a6ad9ed7234222504f1777e17410db13244525ae03b279ed22017d887",
    "cross_cats_sorted": [
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IT",
    "submitted_at": "2018-10-19T05:56:40Z",
    "title_canon_sha256": "745231bb2210a47c81ec74be43d9c4740b4be8babb291aeb813ff2b80c2190ff"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1810.08360",
    "kind": "arxiv",
    "version": 1
  }
}