Pith Number

pith:M7QL4L4V

pith:2010:M7QL4L4VKOSIBEGAXFYEBTZ4F4

not attested not anchored not stored refs pending

Sparse PCA: Convex Relaxations, Algorithms and Applications

Alexandre d'Aspremont, Laurent El Ghaoui, Youwei Zhang

arxiv:1011.3781 v2 · 2010-11-16 · 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{M7QL4L4VKOSIBEGAXFYEBTZ4F4}

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	2026-05-18T04:32:35.887915Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

67e0be2f9553a48090c0b97040cf3c2f2402672a9f7b36153715224fd3d41df6

Aliases

arxiv: 1011.3781 · arxiv_version: 1011.3781v2 · doi: 10.48550/arxiv.1011.3781 · pith_short_12: M7QL4L4VKOSI · pith_short_16: M7QL4L4VKOSIBEGA · pith_short_8: M7QL4L4V

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/M7QL4L4VKOSIBEGAXFYEBTZ4F4 \
  | 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: 67e0be2f9553a48090c0b97040cf3c2f2402672a9f7b36153715224fd3d41df6

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "767804f35be0c7fcb072cece041d9d4c0b6696b3f0bd39cd693ef442157f9c99",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2010-11-16T18:31:12Z",
    "title_canon_sha256": "f78b4d40e16319a593c1fdb92bc94689d9dc79015028f8a21dfed2e96c29214a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1011.3781",
    "kind": "arxiv",
    "version": 2
  }
}