Pith Number

pith:ISJFV4CI

pith:2014:ISJFV4CIISUIHUKL3RCWNJ5YCO

not attested not anchored not stored refs pending

A Projected Preconditioned Conjugate Gradient Algorithm for Computing Many Extreme Eigenpairs of a Hermitian Matrix

Chao Yang, Eugene Vecharynski, John E. Pask

arxiv:1407.7506 v2 · 2014-07-28 · math.NA · physics.comp-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{ISJFV4CIISUIHUKL3RCWNJ5YCO}

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	2026-05-18T01:42:29.248977Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

44925af04844a883d14bdc4566a7b813a307d5bdbe9fb55f244ab662439e45f5

Aliases

arxiv: 1407.7506 · arxiv_version: 1407.7506v2 · doi: 10.48550/arxiv.1407.7506 · pith_short_12: ISJFV4CIISUI · pith_short_16: ISJFV4CIISUIHUKL · pith_short_8: ISJFV4CI

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/ISJFV4CIISUIHUKL3RCWNJ5YCO \
  | 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: 44925af04844a883d14bdc4566a7b813a307d5bdbe9fb55f244ab662439e45f5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e94f15a1891fdbbd276a195850542bc47bda5039e78b19cc47463a3074dca9b7",
    "cross_cats_sorted": [
      "physics.comp-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2014-07-28T19:26:18Z",
    "title_canon_sha256": "48f1a1bbd546a0285907524f553b32b54221ae46905177ee6fc9458802cc5644"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1407.7506",
    "kind": "arxiv",
    "version": 2
  }
}