Pith Number

pith:RT2AJ3W4

pith:2026:RT2AJ3W4JRGK4AV7ZHPTSPFJEE

not attested not anchored not stored refs pending

RCLUPPr: a new randomized CholeskyQR with LU preconditioning

Haoran Guan, Peiting You, Yipei Chen, Yufeng Wei, Yuwei Fan, Zhenyu Zou

arxiv:2607.15561 v1 · 2026-07-17 · 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{RT2AJ3W4JRGK4AV7ZHPTSPFJEE}

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	2026-07-20T00:18:40.299743Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8cf404eedc4c4cae02bfc9df393ca92110596e2cec825025b358a477131c2b6a

Aliases

arxiv: 2607.15561 · arxiv_version: 2607.15561v1 · doi: 10.48550/arxiv.2607.15561 · pith_short_12: RT2AJ3W4JRGK · pith_short_16: RT2AJ3W4JRGK4AV7 · pith_short_8: RT2AJ3W4

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/RT2AJ3W4JRGK4AV7ZHPTSPFJEE \
  | 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: 8cf404eedc4c4cae02bfc9df393ca92110596e2cec825025b358a477131c2b6a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ea675a54fec1a49c42fef63054be2089b00f27959ffb43e33fd13a4850044af2",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2026-07-17T02:04:08Z",
    "title_canon_sha256": "8e98927d22588fbf5182c0b94293593469219427728ccf3dbddf920f7005b5f2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2607.15561",
    "kind": "arxiv",
    "version": 1
  }
}