Pith Number

pith:UQSRPQOZ

pith:2016:UQSRPQOZ3TAHDKL4CTVIOQ6YKY

not attested not anchored not stored refs pending

Some matrix nearness problems suggested by Tikhonov regularization

Lothar Reichel, Silvia Noschese

arxiv:1602.03307 v1 · 2016-02-10 · 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{UQSRPQOZ3TAHDKL4CTVIOQ6YKY}

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	2026-05-18T01:21:00.307268Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a42517c1d9dcc071a97c14ea8743d85616a78c46a26d3a6669f574cac1a0bf81

Aliases

arxiv: 1602.03307 · arxiv_version: 1602.03307v1 · doi: 10.48550/arxiv.1602.03307 · pith_short_12: UQSRPQOZ3TAH · pith_short_16: UQSRPQOZ3TAHDKL4 · pith_short_8: UQSRPQOZ

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/UQSRPQOZ3TAHDKL4CTVIOQ6YKY \
  | 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: a42517c1d9dcc071a97c14ea8743d85616a78c46a26d3a6669f574cac1a0bf81

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "06e2e098a1b0d140a6f26eaeef9def57582f72fd2dbebc15d2ed6941f4197b57",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2016-02-10T09:44:46Z",
    "title_canon_sha256": "a7e5fad0930d43a1b39c76716ed2e299dce807a114a869b43c2bb2c7d539aab7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1602.03307",
    "kind": "arxiv",
    "version": 1
  }
}