Pith Number

pith:OO66I62C

pith:2015:OO66I62CF6XDMNNVUV2HA27SPU

not attested not anchored not stored refs pending

Estimation of Low-Rank Covariance Function

Alexander B. Tsybakov, Karim Lounici, Vladimir Koltchinskii

arxiv:1504.03009 v1 · 2015-04-12 · math.ST · 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{OO66I62CF6XDMNNVUV2HA27SPU}

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	2026-05-18T02:18:59.424391Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

73bde47b422fae3635b5a574706bf27d2935e063d8caddb01e1b385e9800df6c

Aliases

arxiv: 1504.03009 · arxiv_version: 1504.03009v1 · doi: 10.48550/arxiv.1504.03009 · pith_short_12: OO66I62CF6XD · pith_short_16: OO66I62CF6XDMNNV · pith_short_8: OO66I62C

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/OO66I62CF6XDMNNVUV2HA27SPU \
  | 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: 73bde47b422fae3635b5a574706bf27d2935e063d8caddb01e1b385e9800df6c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0a18d040efea43d9ad0125f5dbe8f80ba72634a654953be9379cb1e26016a673",
    "cross_cats_sorted": [
      "stat.TH"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.ST",
    "submitted_at": "2015-04-12T19:23:21Z",
    "title_canon_sha256": "98e92b0521f8dffe1fb9d006cd57884ceacdc6e29992910c13bbeefe9c276ae1"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1504.03009",
    "kind": "arxiv",
    "version": 1
  }
}