Pith Number

pith:KPRRK3MX

pith:2013:KPRRK3MXSHXOSQ7KFAL6TXX6QC

not attested not anchored not stored refs pending

Exact and Stable Covariance Estimation from Quadratic Sampling via Convex Programming

Andrea Goldsmith, Yuejie Chi, Yuxin Chen

arxiv:1310.0807 v5 · 2013-10-02 · cs.IT · cs.LG · math.IT · math.NA · math.ST · 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{KPRRK3MXSHXOSQ7KFAL6TXX6QC}

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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	2026-05-18T02:20:49.996797Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

53e3156d9791eee943ea2817e9defe80ae62a8baa312d53c27aa5de6b8e46416

Aliases

arxiv: 1310.0807 · arxiv_version: 1310.0807v5 · doi: 10.48550/arxiv.1310.0807 · pith_short_12: KPRRK3MXSHXO · pith_short_16: KPRRK3MXSHXOSQ7K · pith_short_8: KPRRK3MX

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/KPRRK3MXSHXOSQ7KFAL6TXX6QC \
  | 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: 53e3156d9791eee943ea2817e9defe80ae62a8baa312d53c27aa5de6b8e46416

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "38ba390a606eaa40b6e4b4548151e32df53e93180dce7ab9285716b07d704c65",
    "cross_cats_sorted": [
      "cs.LG",
      "math.IT",
      "math.NA",
      "math.ST",
      "stat.ML",
      "stat.TH"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IT",
    "submitted_at": "2013-10-02T19:52:57Z",
    "title_canon_sha256": "1dfb7ff2b5acef3df8cc1f0659c695aba30b060473d48d703c65b24fefb465e6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1310.0807",
    "kind": "arxiv",
    "version": 5
  }
}