Pith Number

pith:4HFAA5JB

pith:2013:4HFAA5JBUMDNHTPIOKU5ZKVVCG

not attested not anchored not stored refs pending

Gradient Hard Thresholding Pursuit for Sparsity-Constrained Optimization

Ping Li, Tong Zhang, Xiao-Tong Yuan

arxiv:1311.5750 v2 · 2013-11-22 · cs.LG · cs.NA · stat.ML

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4HFAA5JBUMDNHTPIOKU5ZKVVCG}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more

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	2026-05-18T03:06:21.218270Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e1ca007521a306d3cde872a9dcaab511bc654ebe4ccb7263d00adabc5c3b8d9a

Aliases

arxiv: 1311.5750 · arxiv_version: 1311.5750v2 · doi: 10.48550/arxiv.1311.5750 · pith_short_12: 4HFAA5JBUMDN · pith_short_16: 4HFAA5JBUMDNHTPI · pith_short_8: 4HFAA5JB

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/4HFAA5JBUMDNHTPIOKU5ZKVVCG \
  | 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: e1ca007521a306d3cde872a9dcaab511bc654ebe4ccb7263d00adabc5c3b8d9a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b0ec643f06216ee1b4c98eb49234dfdb43b77d11513e581d570fb21c34b94cac",
    "cross_cats_sorted": [
      "cs.NA",
      "stat.ML"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LG",
    "submitted_at": "2013-11-22T13:52:07Z",
    "title_canon_sha256": "8c94dd187e535514c4a52082d5eb79183b3213eaddc50ef7c4cb1633cda84875"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1311.5750",
    "kind": "arxiv",
    "version": 2
  }
}