Pith Number

pith:7LSAHZSR

pith:2019:7LSAHZSRSCDXS2YKACMPOU7ERI

not attested not anchored not stored refs pending

All Sparse PCA Models Are Wrong, But Some Are Useful. Part I: Computation of Scores, Residuals and Explained Variance

A.K. Smilde, E. Saccenti, J.A. Westerhuis, J. Camacho

arxiv:1907.03989 v1 · 2019-07-09 · stat.ML · cs.LG

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7LSAHZSRSCDXS2YKACMPOU7ERI}

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	2026-07-05T01:52:33.001272Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fae403e6519087796b0a0098f753e48a2c94d2e0c8fb0491b00ab2b84a00dc02

Aliases

arxiv: 1907.03989 · arxiv_version: 1907.03989v1 · doi: 10.48550/arxiv.1907.03989 · pith_short_12: 7LSAHZSRSCDX · pith_short_16: 7LSAHZSRSCDXS2YK · pith_short_8: 7LSAHZSR

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/7LSAHZSRSCDXS2YKACMPOU7ERI \
  | 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: fae403e6519087796b0a0098f753e48a2c94d2e0c8fb0491b00ab2b84a00dc02

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "778bfedfd982ebb3e3a637754452b7fc2f731a85457042925db603cc92cf66ea",
    "cross_cats_sorted": [
      "cs.LG"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "stat.ML",
    "submitted_at": "2019-07-09T05:27:20Z",
    "title_canon_sha256": "0e64a4d6b127ac4b644783c6cad91ac8b9c73d235b1f6e414de0c348c9340cb3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1907.03989",
    "kind": "arxiv",
    "version": 1
  }
}