Pith Number

pith:NLS4NPUJ

pith:2019:NLS4NPUJHGFU4YGHZGC6PWJAYG

not attested not anchored not stored refs pending

The conjugate gradient algorithm on well-conditioned Wishart matrices is almost deterministic

Percy Deift, Thomas Trogdon

arxiv:1901.09007 v3 · 2019-01-25 · math.NA · cs.CC · cs.NA · math.PR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{NLS4NPUJHGFU4YGHZGC6PWJAYG}

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.

Cited by

1 paper in Pith

A Randomized Algorithm for Preconditioner Selection

Receipt and verification

First computed	2026-07-05T00:09:24.715089Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6ae5c6be89398b4e60c7c985e7d920c1b51d4853fb6b987a88af0ec7f14bc249

Aliases

arxiv: 1901.09007 · arxiv_version: 1901.09007v3 · doi: 10.48550/arxiv.1901.09007 · pith_short_12: NLS4NPUJHGFU · pith_short_16: NLS4NPUJHGFU4YGH · pith_short_8: NLS4NPUJ

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/NLS4NPUJHGFU4YGHZGC6PWJAYG \
  | 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: 6ae5c6be89398b4e60c7c985e7d920c1b51d4853fb6b987a88af0ec7f14bc249

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2900f33019734cc2acb1ce75d756e6dc013abe73737bde177749fd8d3e3c4729",
    "cross_cats_sorted": [
      "cs.CC",
      "cs.NA",
      "math.PR"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2019-01-25T18:14:49Z",
    "title_canon_sha256": "444d1bb7d8743082b7a29691b43f4ebb1d28d11139edf7098c678e8dc6ba69be"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1901.09007",
    "kind": "arxiv",
    "version": 3
  }
}