Pith Number

pith:XRSTUYD4

pith:2011:XRSTUYD4UXPS2JRS4BNMOYD4G7

not attested not anchored not stored refs pending

Structured Sparsity via Alternating Direction Methods

Donald Goldfarb, Zhiwei Qin

arxiv:1105.0728 v2 · 2011-05-04 · math.OC · cs.AI · stat.ML

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{XRSTUYD4UXPS2JRS4BNMOYD4G7}

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	2026-05-18T02:59:45.566000Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bc653a607ca5df2d2632e05ac7607c37da7fc49e82eae3e900d1fb1f1813a2e9

Aliases

arxiv: 1105.0728 · arxiv_version: 1105.0728v2 · doi: 10.48550/arxiv.1105.0728 · pith_short_12: XRSTUYD4UXPS · pith_short_16: XRSTUYD4UXPS2JRS · pith_short_8: XRSTUYD4

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/XRSTUYD4UXPS2JRS4BNMOYD4G7 \
  | 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: bc653a607ca5df2d2632e05ac7607c37da7fc49e82eae3e900d1fb1f1813a2e9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cff82aac63d73808794d5cd2f574819f3f16d6c8fe0ec2bf88bc9cb716fa6f75",
    "cross_cats_sorted": [
      "cs.AI",
      "stat.ML"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2011-05-04T03:02:19Z",
    "title_canon_sha256": "c574e549b08cae6b316b03991d1767d030e947b467407b23a1258076711e86b6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1105.0728",
    "kind": "arxiv",
    "version": 2
  }
}