Pith Number

pith:GU6RNIVX

pith:2012:GU6RNIVX27KUKJTL5UBTY244XJ

not attested not anchored not stored refs pending

Metrics and norms used for obtaining sparse solutions to underdetermined Systems of Linear Equations

George K. Papageorgiou, Leoni Dalla

arxiv:1203.4579 v2 · 2012-03-20 · math.OC · math.FA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{GU6RNIVX27KUKJTL5UBTY244XJ}

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	2026-05-18T03:57:24.294527Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

353d16a2b7d7d545266bed033c6b9cba5346ac60ca586bf76b1c5200850136ee

Aliases

arxiv: 1203.4579 · arxiv_version: 1203.4579v2 · doi: 10.48550/arxiv.1203.4579 · pith_short_12: GU6RNIVX27KU · pith_short_16: GU6RNIVX27KUKJTL · pith_short_8: GU6RNIVX

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/GU6RNIVX27KUKJTL5UBTY244XJ \
  | 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: 353d16a2b7d7d545266bed033c6b9cba5346ac60ca586bf76b1c5200850136ee

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f61b69b83f9ce1b8182a50c69c54a260272363bf1c8158955b020d34120df836",
    "cross_cats_sorted": [
      "math.FA"
    ],
    "license": "http://creativecommons.org/licenses/by/3.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2012-03-20T20:23:44Z",
    "title_canon_sha256": "c255f6a16727977052ce7ceac0202dbd89a3de0029d271aaedb6b7f62f7c2ec7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1203.4579",
    "kind": "arxiv",
    "version": 2
  }
}