Pith Number

pith:3JZFIET5

pith:2004:3JZFIET5SFPOCX6EMNGQ6JCKET

not attested not anchored not stored refs pending

A direct formulation for sparse PCA using semidefinite programming

Alexandre d'Aspremont, Gert R. G. Lanckriet, Laurent El Ghaoui, Michael I. Jordan

arxiv:cs/0406021 v3 · 2004-06-16 · cs.CE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{3JZFIET5SFPOCX6EMNGQ6JCKET}

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	2026-07-04T14:49:46.541053Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

da7254127d915ee15fc4634d0f244a24dfe1f41fcb61abfe7db9bfd682adada9

Aliases

arxiv: cs/0406021 · arxiv_version: cs/0406021v3 · doi: 10.48550/arxiv.cs/0406021 · pith_short_12: 3JZFIET5SFPO · pith_short_16: 3JZFIET5SFPOCX6E · pith_short_8: 3JZFIET5

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/3JZFIET5SFPOCX6EMNGQ6JCKET \
  | 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: da7254127d915ee15fc4634d0f244a24dfe1f41fcb61abfe7db9bfd682adada9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cec24fc046d6bd0a260cfd5328bebe7be7f5e589a06e9ce760582af693835fe7",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "cs.CE",
    "submitted_at": "2004-06-16T01:23:03Z",
    "title_canon_sha256": "fdcd2572a3513ce6b208f7ccf7da0b918c5f68ef97ae7565b9f406a0a2fd4d67"
  },
  "schema_version": "1.0",
  "source": {
    "id": "cs/0406021",
    "kind": "arxiv",
    "version": 3
  }
}