Pith Number

pith:4ISMZJNR

pith:2017:4ISMZJNR6DXFFAOFTGEQWCQC4O

not attested not anchored not stored refs pending

Heuristic parameter choice in Tikhonov method from minimizers of the quasi-optimality function

Toomas Raus, Uno H\"amarik

arxiv:1708.02149 v1 · 2017-08-07 · 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{4ISMZJNR6DXFFAOFTGEQWCQC4O}

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	2026-05-18T00:38:31.933937Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e224cca5b1f0ee5281c599890b0a02e3809bdd81986a8fe25fa38656ad44634e

Aliases

arxiv: 1708.02149 · arxiv_version: 1708.02149v1 · doi: 10.48550/arxiv.1708.02149 · pith_short_12: 4ISMZJNR6DXF · pith_short_16: 4ISMZJNR6DXFFAOF · pith_short_8: 4ISMZJNR

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/4ISMZJNR6DXFFAOFTGEQWCQC4O \
  | 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: e224cca5b1f0ee5281c599890b0a02e3809bdd81986a8fe25fa38656ad44634e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8678c1d17a0130f63dcf123214e969245eebeb4e51b12920f8c50a1871f9cb95",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2017-08-07T15:00:55Z",
    "title_canon_sha256": "63e2685890785aab56b448acfdd3327e304c5760b3cdf11e48239f450c5d8d85"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1708.02149",
    "kind": "arxiv",
    "version": 1
  }
}