Pith Number

pith:HGO5V43S

pith:2018:HGO5V43S5RUI2E2ECR7UO3ZDJT

not attested not anchored not stored refs pending

The Low Rank Approximations and Ritz Values in LSQR For Linear Discrete Ill-Posed Problems

Zhongxiao Jia

arxiv:1811.03454 v2 · 2018-11-07 · 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{HGO5V43S5RUI2E2ECR7UO3ZDJT}

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	2026-06-04T20:13:40.101729Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

399ddaf372ec688d1344147f476f234cdd2f35e6347b28820a34418f49616d51

Aliases

arxiv: 1811.03454 · arxiv_version: 1811.03454v2 · doi: 10.48550/arxiv.1811.03454 · pith_short_12: HGO5V43S5RUI · pith_short_16: HGO5V43S5RUI2E2E · pith_short_8: HGO5V43S

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/HGO5V43S5RUI2E2ECR7UO3ZDJT \
  | 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: 399ddaf372ec688d1344147f476f234cdd2f35e6347b28820a34418f49616d51

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "df1fbe7905167748570727324ed5aa06fadfc65621a17f8c7360f9a0db1e5b5d",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2018-11-07T08:55:47Z",
    "title_canon_sha256": "4bddaeeeb0cdbde8fe6c6bf240e8aa28a4f79da32d6710de507ac5ec9750a9f4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1811.03454",
    "kind": "arxiv",
    "version": 2
  }
}