Pith Number

pith:Y6FP4NL6

pith:2025:Y6FP4NL6REQXJD2EVJLQFXETMS

not attested not anchored not stored refs pending

Lanczos with compression for symmetric matrix Lyapunov equations

Angelo A. Casulli, Daniel Kressner, Francesco Hrobat

arxiv:2505.22498 v1 · 2025-05-28 · 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{Y6FP4NL6REQXJD2EVJLQFXETMS}

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	2026-07-05T11:11:25.290509Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c78afe357e8921748f44aa5702dc936482bc15ed98e40dd6aff01d8662e80b8c

Aliases

arxiv: 2505.22498 · arxiv_version: 2505.22498v1 · doi: 10.48550/arxiv.2505.22498 · pith_short_12: Y6FP4NL6REQX · pith_short_16: Y6FP4NL6REQXJD2E · pith_short_8: Y6FP4NL6

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/Y6FP4NL6REQXJD2EVJLQFXETMS \
  | 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: c78afe357e8921748f44aa5702dc936482bc15ed98e40dd6aff01d8662e80b8c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0d19e2f65210922c052dfa88b1fde6efa8d137eb50b65b5b91b50c3a0a9dd737",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2025-05-28T15:49:35Z",
    "title_canon_sha256": "0f14563119db497603a70ee5ed481f71ca46f01673b50f18452dbe8c5fd197ba"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2505.22498",
    "kind": "arxiv",
    "version": 1
  }
}