Pith Number

pith:AHCV57RS

pith:2018:AHCV57RSPSPWEDSZCE4IJIFVXH

not attested not anchored not stored refs pending

Optimal Covariance Estimation for Condition Number Loss in the Spiked Model

Behrooz Ghorbani, David L. Donoho

arxiv:1810.07403 v1 · 2018-10-17 · math.ST · stat.ME · 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{AHCV57RSPSPWEDSZCE4IJIFVXH}

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	2026-05-18T00:02:56.467909Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

01c55efe327c9f620e59113884a0b5b9cad28d21792d22e5686785c6798d7439

Aliases

arxiv: 1810.07403 · arxiv_version: 1810.07403v1 · doi: 10.48550/arxiv.1810.07403 · pith_short_12: AHCV57RSPSPW · pith_short_16: AHCV57RSPSPWEDSZ · pith_short_8: AHCV57RS

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/AHCV57RSPSPWEDSZCE4IJIFVXH \
  | 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: 01c55efe327c9f620e59113884a0b5b9cad28d21792d22e5686785c6798d7439

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "726293e0eccf16b3cedd4cd625c2fc46a0bf6d9d1fddca41d5bb0905ba4b8d0d",
    "cross_cats_sorted": [
      "stat.ME",
      "stat.TH"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.ST",
    "submitted_at": "2018-10-17T07:11:02Z",
    "title_canon_sha256": "1fc36225a8e5236ef388aa4a3ed7488f054b48ecdecc1cdf57cbe13d15b13832"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1810.07403",
    "kind": "arxiv",
    "version": 1
  }
}