Pith Number

pith:OK537PAA

pith:2021:OK537PAA227VQKDTMUDFHZVWMY

not attested not anchored not stored refs pending

DC algorithms for a class of sparse group $\ell_0$ regularized optimization problems

Kim-Chuan Toh, Wei Bian, Wenjing Li

arxiv:2109.05251 v2 · 2021-09-11 · 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{OK537PAA227VQKDTMUDFHZVWMY}

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	2026-07-05T04:20:29.545085Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

72bbbfbc00d6bf582873650653e6b6663767a4ee96e0821e09b63c855142ba1e

Aliases

arxiv: 2109.05251 · arxiv_version: 2109.05251v2 · doi: 10.48550/arxiv.2109.05251 · pith_short_12: OK537PAA227V · pith_short_16: OK537PAA227VQKDT · pith_short_8: OK537PAA

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/OK537PAA227VQKDTMUDFHZVWMY \
  | 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: 72bbbfbc00d6bf582873650653e6b6663767a4ee96e0821e09b63c855142ba1e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e89247e105441e5079bb4d4188972bfb2f87221be84f678a1b9d590d8f4ce3e0",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2021-09-11T10:39:53Z",
    "title_canon_sha256": "8faa77c85e2202a95391bbe8b4b702aadaec4682a48240a6f85b8071e1a5cd31"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2109.05251",
    "kind": "arxiv",
    "version": 2
  }
}