Pith Number

pith:QHQVJWRJ

pith:2017:QHQVJWRJCBYAGF4SHKKABWPUDC

not attested not anchored not stored refs pending

Efficient Covariance Approximations for Large Sparse Precision Matrices

David Bolin, Finn Lindgren, Mattias Villani, Per Sid\'en

arxiv:1705.08656 v2 · 2017-05-24 · stat.CO · math.NA · 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{QHQVJWRJCBYAGF4SHKKABWPUDC}

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	2026-05-18T00:28:55.600801Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

81e154da2910700317923a9400d9f41898b17f4027b721d0fe058e8130eedaee

Aliases

arxiv: 1705.08656 · arxiv_version: 1705.08656v2 · doi: 10.48550/arxiv.1705.08656 · pith_short_12: QHQVJWRJCBYA · pith_short_16: QHQVJWRJCBYAGF4S · pith_short_8: QHQVJWRJ

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/QHQVJWRJCBYAGF4SHKKABWPUDC \
  | 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: 81e154da2910700317923a9400d9f41898b17f4027b721d0fe058e8130eedaee

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0135d0f26eccbbb2dba6c13717976f21165d5c37820edade669e4eebcce5a995",
    "cross_cats_sorted": [
      "math.NA",
      "stat.ME"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "stat.CO",
    "submitted_at": "2017-05-24T08:32:46Z",
    "title_canon_sha256": "733fe2172acfb5e4fa40e49b956e4a21d20ca4877fc226c1b9e625893adff89b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1705.08656",
    "kind": "arxiv",
    "version": 2
  }
}