Pith Number

pith:FAWIGQSD

pith:2018:FAWIGQSDKWUN5C57VRR3QZ2T3A

not attested not anchored not stored refs pending

Two-level preconditioning for Ridge Regression

Jaak Simm, Joris Tavernier, Karl Meerbergen, Yves Moreau

arxiv:1806.05826 v2 · 2018-06-15 · math.NA · cs.NA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{FAWIGQSDKWUN5C57VRR3QZ2T3A}

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	2026-06-04T19:11:58.884549Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

282c83424355a8de8bbfac63b86753d809e7b90b3b04f7ec0a00784bc6d7d33b

Aliases

arxiv: 1806.05826 · arxiv_version: 1806.05826v2 · doi: 10.48550/arxiv.1806.05826 · pith_short_12: FAWIGQSDKWUN · pith_short_16: FAWIGQSDKWUN5C57 · pith_short_8: FAWIGQSD

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/FAWIGQSDKWUN5C57VRR3QZ2T3A \
  | 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: 282c83424355a8de8bbfac63b86753d809e7b90b3b04f7ec0a00784bc6d7d33b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ced84b628d3f60e03992fe4a1e6569101d55282ad79f1fe550f69f5db5a286eb",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2018-06-15T06:59:49Z",
    "title_canon_sha256": "8b94c4198ebded9839556587d64c65d63a16d0447a3eaa5492d97653375a765b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1806.05826",
    "kind": "arxiv",
    "version": 2
  }
}