Pith Number

pith:COZMNWC4

pith:2017:COZMNWC4E7XEA2VPN6K7G6MZZU

not attested not anchored not stored refs pending

On the Suboptimality of Proximal Gradient Descent for $\ell^{0}$ Sparse Approximation

Jianchao Yang, Jiashi Feng, Nebojsa Jojic, Thomas S. Huang, Yingzhen Yang

arxiv:1709.01230 v1 · 2017-09-05 · math.OC · 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{COZMNWC4E7XEA2VPN6K7G6MZZU}

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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	2026-05-18T00:36:00.616717Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

13b2c6d85c27ee406aaf6f95f37999cd009a1ef36c765f1ab4ffe8b0c807048e

Aliases

arxiv: 1709.01230 · arxiv_version: 1709.01230v1 · doi: 10.48550/arxiv.1709.01230 · pith_short_12: COZMNWC4E7XE · pith_short_16: COZMNWC4E7XEA2VP · pith_short_8: COZMNWC4

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/COZMNWC4E7XEA2VPN6K7G6MZZU \
  | 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: 13b2c6d85c27ee406aaf6f95f37999cd009a1ef36c765f1ab4ffe8b0c807048e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "05c7f50dedf14fac9cc3db80e44845aafd1788b1c308461b1de74f69433567a8",
    "cross_cats_sorted": [
      "cs.LG"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2017-09-05T04:06:19Z",
    "title_canon_sha256": "8541a3562431e788e5c6866698da615b2e645c211a3496c9915c07caffe27715"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1709.01230",
    "kind": "arxiv",
    "version": 1
  }
}