Pith Number

pith:SEXNRMUK

pith:2018:SEXNRMUKWT3AUGAQP2FYJEVMNR

not attested not anchored not stored refs pending

Semi-Heuristic Parameter Choice Rules for Tikhonov Regularisation with Operator Perturbations

Kemal Raik, Stefan Kindermann, Uno H\"amarik, Urve Kangro

arxiv:1807.05042 v1 · 2018-07-13 · math.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{SEXNRMUKWT3AUGAQP2FYJEVMNR}

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	2026-05-18T00:10:49.167097Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

912ed8b28ab4f60a18107e8b8492ac6c56768795383aff765fb9ea1e9c073b9a

Aliases

arxiv: 1807.05042 · arxiv_version: 1807.05042v1 · doi: 10.48550/arxiv.1807.05042 · pith_short_12: SEXNRMUKWT3A · pith_short_16: SEXNRMUKWT3AUGAQ · pith_short_8: SEXNRMUK

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/SEXNRMUKWT3AUGAQP2FYJEVMNR \
  | 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: 912ed8b28ab4f60a18107e8b8492ac6c56768795383aff765fb9ea1e9c073b9a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "72351138b3332c8287bee265210cacca6dc75b9e89c306873b63300a0cc7b4da",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2018-07-13T12:48:50Z",
    "title_canon_sha256": "4c84b04c25eab91985967a8a67bef80bd282629f0fc86b8b16b6e8de2716e98b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1807.05042",
    "kind": "arxiv",
    "version": 1
  }
}