Pith Number

pith:HMDBCD7F

pith:2011:HMDBCD7F4METD5FCXVVW4Y6HFL

not attested not anchored not stored refs pending

A Constrained L1 Minimization Approach to Sparse Precision Matrix Estimation

Tony Cai, Weidong Liu, Xi Luo

arxiv:1102.2233 v1 · 2011-02-10 · stat.ME

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{HMDBCD7F4METD5FCXVVW4Y6HFL}

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	2026-05-18T04:28:56.464707Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3b06110fe5e30931f4a2bd6b6e63c72ac8d4e430492b2181c741e4491c542486

Aliases

arxiv: 1102.2233 · arxiv_version: 1102.2233v1 · doi: 10.48550/arxiv.1102.2233 · pith_short_12: HMDBCD7F4MET · pith_short_16: HMDBCD7F4METD5FC · pith_short_8: HMDBCD7F

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/HMDBCD7F4METD5FCXVVW4Y6HFL \
  | 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: 3b06110fe5e30931f4a2bd6b6e63c72ac8d4e430492b2181c741e4491c542486

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b2ff9350e49699ea76433a31c92ac151bfafd60fc4330e0aa6620e7e7e41b2f5",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "stat.ME",
    "submitted_at": "2011-02-10T21:01:18Z",
    "title_canon_sha256": "487b3da0255d9deaf385481572e2958ae91ae256bfed2d45d3e35fe89d5db0ba"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1102.2233",
    "kind": "arxiv",
    "version": 1
  }
}