Pith Number

pith:4I3V5ZPG

pith:2018:4I3V5ZPGL2GNCY5NCJN2NZXTQD

not attested not anchored not stored refs pending

Regularization of time-varying covariance matrices using linear stochastic systems

Lipeng Ning

arxiv:1805.11701 v1 · 2018-05-29 · math.OC · math.DS

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4I3V5ZPGL2GNCY5NCJN2NZXTQD}

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	2026-05-18T00:14:36.875787Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e2375ee5e65e8cd163ad125ba6e6f380e11de8913425a71aedc3fc76c294fdc4

Aliases

arxiv: 1805.11701 · arxiv_version: 1805.11701v1 · doi: 10.48550/arxiv.1805.11701 · pith_short_12: 4I3V5ZPGL2GN · pith_short_16: 4I3V5ZPGL2GNCY5N · pith_short_8: 4I3V5ZPG

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/4I3V5ZPGL2GNCY5NCJN2NZXTQD \
  | 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: e2375ee5e65e8cd163ad125ba6e6f380e11de8913425a71aedc3fc76c294fdc4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "869209796ab80ac264ad4131b6cd8940a03db0ebd5147596dab46b7f3f1eb249",
    "cross_cats_sorted": [
      "math.DS"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2018-05-29T20:37:16Z",
    "title_canon_sha256": "063c6aa095c2cc1230db24efbc23edfc8253cfd0587b5b49618c3fb5a6000543"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1805.11701",
    "kind": "arxiv",
    "version": 1
  }
}