Pith Number

pith:5QNK237T

pith:2019:5QNK237TK5XGCOAOUAQQSZKDGY

not attested not anchored not stored refs pending

Nonconvex fraction function recovery sparse signal by convex optimization algorithm

Angang Cui, Haiyang Li, Jigen Peng, Meng Wen

arxiv:1905.05436 v2 · 2019-05-14 · 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{5QNK237TK5XGCOAOUAQQSZKDGY}

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	2026-05-17T23:44:53.911848Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

ec1aad6ff3576e61380ea021096543360d177af299ca24ad988bd6b7ebd4cfac

Aliases

arxiv: 1905.05436 · arxiv_version: 1905.05436v2 · doi: 10.48550/arxiv.1905.05436 · pith_short_12: 5QNK237TK5XG · pith_short_16: 5QNK237TK5XGCOAO · pith_short_8: 5QNK237T

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/5QNK237TK5XGCOAOUAQQSZKDGY \
  | 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: ec1aad6ff3576e61380ea021096543360d177af299ca24ad988bd6b7ebd4cfac

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7b9e111b0194352dab196c2f2be311641e847ce82722c3ee4550fb13c589da57",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2019-05-14T08:00:09Z",
    "title_canon_sha256": "39487b1d711e4f937a83b6ba705372a186cad64a111092139ee6d3529e1c4c9a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1905.05436",
    "kind": "arxiv",
    "version": 2
  }
}