Pith Number

pith:KI3UXMYF

pith:2014:KI3UXMYFCSGQBE5Y24JABHZ2EB

not attested not anchored not stored refs pending

Sparse and Low-Rank Covariance Matrices Estimation

Lingchen Kong, Naihua Xiu, Shenglong Zhou, Ziyan Luo

arxiv:1407.4596 v2 · 2014-07-17 · math.ST · math.OC · stat.ML · 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{KI3UXMYFCSGQBE5Y24JABHZ2EB}

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	2026-05-18T02:45:40.641576Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

52374bb305148d0093b8d712009f3a2048931fe1fdca5abbf246abd70a73560e

Aliases

arxiv: 1407.4596 · arxiv_version: 1407.4596v2 · doi: 10.48550/arxiv.1407.4596 · pith_short_12: KI3UXMYFCSGQ · pith_short_16: KI3UXMYFCSGQBE5Y · pith_short_8: KI3UXMYF

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/KI3UXMYFCSGQBE5Y24JABHZ2EB \
  | 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: 52374bb305148d0093b8d712009f3a2048931fe1fdca5abbf246abd70a73560e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cdafadce7fa83633eccc539d6a748e017f7c805517fe5570aa82418ca6b9a1cf",
    "cross_cats_sorted": [
      "math.OC",
      "stat.ML",
      "stat.TH"
    ],
    "license": "http://creativecommons.org/licenses/by/3.0/",
    "primary_cat": "math.ST",
    "submitted_at": "2014-07-17T08:28:57Z",
    "title_canon_sha256": "b995e4a0133c10641dd3a51beb993fb96f4cefe1b5e29711d8820ea861469b70"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1407.4596",
    "kind": "arxiv",
    "version": 2
  }
}