Pith Number

pith:WVSX5LTY

pith:2007:WVSX5LTYKNDAYJNYOWP5ADXZTO

not attested not anchored not stored refs pending

Optimal Solutions for Sparse Principal Component Analysis

Alexandre d'Aspremont, Francis Bach, Laurent El Ghaoui

arxiv:0707.0705 v4 · 2007-07-04 · cs.AI · 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{WVSX5LTYKNDAYJNYOWP5ADXZTO}

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	2026-05-18T04:09:15.786506Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b5657eae7853460c25b8759fd00ef99bbe4c09f6fb8f5a5a74fc06541d00ad3a

Aliases

arxiv: 0707.0705 · arxiv_version: 0707.0705v4 · doi: 10.48550/arxiv.0707.0705 · pith_short_12: WVSX5LTYKNDA · pith_short_16: WVSX5LTYKNDAYJNY · pith_short_8: WVSX5LTY

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/WVSX5LTYKNDAYJNYOWP5ADXZTO \
  | 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: b5657eae7853460c25b8759fd00ef99bbe4c09f6fb8f5a5a74fc06541d00ad3a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bad9c59eb374ffa921ab85730825fa287a3255e3c44ff849d87d195ca8dddbde",
    "cross_cats_sorted": [
      "cs.LG"
    ],
    "license": "",
    "primary_cat": "cs.AI",
    "submitted_at": "2007-07-04T22:28:28Z",
    "title_canon_sha256": "409149ed7f7458e1b6c4fdbcbb676bbfa5891a43821a436add530cfbeb16225d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0707.0705",
    "kind": "arxiv",
    "version": 4
  }
}