Pith Number

pith:XUJ5XJ7A

pith:2013:XUJ5XJ7AANVMCLCWOCUC7YAYDE

not attested not anchored not stored refs pending

On the Conditions of Sparse Parameter Estimation via Log-Sum Penalty Regularization

Changshui Zhang, Guangdong Hou, Zheng Pan

arxiv:1308.6504 v2 · 2013-08-29 · cs.IT · math.IT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{XUJ5XJ7AANVMCLCWOCUC7YAYDE}

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	2026-05-18T02:58:21.758203Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bd13dba7e0036ac12c5670a82fe018191ac2edabf269fe82ce0f1c5cf5b8b050

Aliases

arxiv: 1308.6504 · arxiv_version: 1308.6504v2 · doi: 10.48550/arxiv.1308.6504 · pith_short_12: XUJ5XJ7AANVM · pith_short_16: XUJ5XJ7AANVMCLCW · pith_short_8: XUJ5XJ7A

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/XUJ5XJ7AANVMCLCWOCUC7YAYDE \
  | 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: bd13dba7e0036ac12c5670a82fe018191ac2edabf269fe82ce0f1c5cf5b8b050

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5c252d16a7b7d97236dc0ec407acf849624a94b77df79e0fdb500c7ab81040dc",
    "cross_cats_sorted": [
      "math.IT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.IT",
    "submitted_at": "2013-08-29T16:02:01Z",
    "title_canon_sha256": "5953cefa4f03828e4a51900d1ad1a9ebd5f5cbdf4c91a619e7f4d32d032af486"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1308.6504",
    "kind": "arxiv",
    "version": 2
  }
}