Pith Number

pith:6K6KDFEI

pith:2011:6K6KDFEIENH6WQHG6BQKTGYFS4

not attested not anchored not stored refs pending

Learning a Factor Model via Regularized PCA

Benjamin Van Roy, Yi-Hao Kao

arxiv:1111.6201 v4 · 2011-11-26 · cs.LG · stat.ML

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{6K6KDFEIENH6WQHG6BQKTGYFS4}

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	2026-05-18T03:22:17.538659Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f2bca19488234feb40e6f060a99b0597072a05bb5c5cd91109ead7f69fb2ddf9

Aliases

arxiv: 1111.6201 · arxiv_version: 1111.6201v4 · doi: 10.48550/arxiv.1111.6201 · pith_short_12: 6K6KDFEIENH6 · pith_short_16: 6K6KDFEIENH6WQHG · pith_short_8: 6K6KDFEI

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/6K6KDFEIENH6WQHG6BQKTGYFS4 \
  | 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: f2bca19488234feb40e6f060a99b0597072a05bb5c5cd91109ead7f69fb2ddf9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2b7acd8df319c0c80eb08085e5c0070a8d84c877cfa00ad66bbd75d8d6e6c098",
    "cross_cats_sorted": [
      "stat.ML"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LG",
    "submitted_at": "2011-11-26T23:36:40Z",
    "title_canon_sha256": "5add1cb2ed67af803400acc1cd031a13d5ad2121728282de45882072eebabfd2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1111.6201",
    "kind": "arxiv",
    "version": 4
  }
}