Pith Number

pith:BGQPOQWX

pith:2009:BGQPOQWXAAVFPAKE3MRKM26LA7

not attested not anchored not stored refs pending

Accelerating gradient projection methods for $\ell_1$-constrained signal recovery by steplength selection rules

C. De Mol, I. Loris, L. Zanni, M. Bertero, R. Zanella

arxiv:0902.4424 v1 · 2009-02-25 · math.NA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{BGQPOQWXAAVFPAKE3MRKM26LA7}

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	2026-05-18T03:37:42.129650Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

09a0f742d7002a578144db22a66bcb07f5b8efdcf51a003a7c25c5b275297b6e

Aliases

arxiv: 0902.4424 · arxiv_version: 0902.4424v1 · doi: 10.48550/arxiv.0902.4424 · pith_short_12: BGQPOQWXAAVF · pith_short_16: BGQPOQWXAAVFPAKE · pith_short_8: BGQPOQWX

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/BGQPOQWXAAVFPAKE3MRKM26LA7 \
  | 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: 09a0f742d7002a578144db22a66bcb07f5b8efdcf51a003a7c25c5b275297b6e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "97d25952afaef67b94050705e62d31abf4a34b851ab5b39ce13b2c5791e0e9bd",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2009-02-25T17:07:08Z",
    "title_canon_sha256": "e919307a0d7150ea4367d15701d5403f701ba04c08dd64cb542c9f3b7613e29d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0902.4424",
    "kind": "arxiv",
    "version": 1
  }
}