Pith Number

pith:OYT3KMW3

pith:2014:OYT3KMW3DHJJWJHIVJ2SMPIIOR

not attested not anchored not stored refs pending

Projection Algorithms for Non-Convex Minimization with Application to Sparse Principal Component Analysis

Dzung T. Phan, Jia-Jie Zhu, William W. Hager

arxiv:1404.4132 v5 · 2014-04-16 · cs.NA · math.OC

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{OYT3KMW3DHJJWJHIVJ2SMPIIOR}

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	2026-05-17T23:49:18.249838Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7627b532db19d29b24e8aa75263d087454ba049a253368088cfd5e29f38c1792

Aliases

arxiv: 1404.4132 · arxiv_version: 1404.4132v5 · doi: 10.48550/arxiv.1404.4132 · pith_short_12: OYT3KMW3DHJJ · pith_short_16: OYT3KMW3DHJJWJHI · pith_short_8: OYT3KMW3

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/OYT3KMW3DHJJWJHIVJ2SMPIIOR \
  | 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: 7627b532db19d29b24e8aa75263d087454ba049a253368088cfd5e29f38c1792

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "47c39791a4277f50135aeedce062ffdf86d845002d0964e2179d74d06f81a5d9",
    "cross_cats_sorted": [
      "math.OC"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.NA",
    "submitted_at": "2014-04-16T03:57:42Z",
    "title_canon_sha256": "b30e929ad573480d924c6421e25b7d6d93143fd0cadbc8730798d64480f2338b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1404.4132",
    "kind": "arxiv",
    "version": 5
  }
}