Pith Number

pith:HQ4R6PIE

pith:2013:HQ4R6PIED62TUE74MHJII5NXFE

not attested not anchored not stored refs pending

Do semidefinite relaxations solve sparse PCA up to the information limit?

Boaz Nadler, Dan Vilenchik, Robert Krauthgamer

arxiv:1306.3690 v4 · 2013-06-16 · math.ST · stat.ML · stat.TH

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HQ4R6PIED62TUE74MHJII5NXFE}

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	2026-05-18T01:58:27.463788Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3c391f3d041fb53a13fc61d28475b7290312da80a3dbc44baf33e64eeecbee22

Aliases

arxiv: 1306.3690 · arxiv_version: 1306.3690v4 · doi: 10.48550/arxiv.1306.3690 · pith_short_12: HQ4R6PIED62T · pith_short_16: HQ4R6PIED62TUE74 · pith_short_8: HQ4R6PIE

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/HQ4R6PIED62TUE74MHJII5NXFE \
  | 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: 3c391f3d041fb53a13fc61d28475b7290312da80a3dbc44baf33e64eeecbee22

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5347d7c6fc4176319b91a318ca8238e47fc5e302b07405979d754d65beb9ee97",
    "cross_cats_sorted": [
      "stat.ML",
      "stat.TH"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.ST",
    "submitted_at": "2013-06-16T17:40:09Z",
    "title_canon_sha256": "23a7b1795beea0676fdbe9f985bc034041c098dd00fe0c6c30e7e5471fa8a1e4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1306.3690",
    "kind": "arxiv",
    "version": 4
  }
}