Pith Number

pith:RCTUZ2ZM

pith:2017:RCTUZ2ZMJ47RHXHWV63I2VWBND

not attested not anchored not stored refs pending

Regularization of the Kernel Matrix via Covariance Matrix Shrinkage Estimation

Tomer Lancewicki

arxiv:1707.06156 v1 · 2017-07-19 · 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{RCTUZ2ZMJ47RHXHWV63I2VWBND}

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	2026-05-18T00:39:57.435392Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

88a74ceb2c4f3f13dcf6afb68d56c168fa944f1a6d11f59b0f326b17c4277461

Aliases

arxiv: 1707.06156 · arxiv_version: 1707.06156v1 · doi: 10.48550/arxiv.1707.06156 · pith_short_12: RCTUZ2ZMJ47R · pith_short_16: RCTUZ2ZMJ47RHXHW · pith_short_8: RCTUZ2ZM

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/RCTUZ2ZMJ47RHXHWV63I2VWBND \
  | 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: 88a74ceb2c4f3f13dcf6afb68d56c168fa944f1a6d11f59b0f326b17c4277461

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7f2f37c3a2660d036116d752abde994209eb674900c3a02d62e18fc4082167df",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "stat.CO",
    "submitted_at": "2017-07-19T15:31:54Z",
    "title_canon_sha256": "89b808a99dbe7f800df53074d3b275b978fec47a6901806f16c84a4aeb9bbd8a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1707.06156",
    "kind": "arxiv",
    "version": 1
  }
}