Pith Number

pith:2VD2MCHO

pith:2009:2VD2MCHOL4QRWGU45BWLWUZSAX

not attested not anchored not stored refs pending

QR Factorization of Tall and Skinny Matrices in a Grid Computing Environment

Camille Coti, Emmanuel Agullo, Jack Dongarra, Julien Langou, Thomas Herault

arxiv:0912.2572 v1 · 2009-12-14 · cs.DC · 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{2VD2MCHOL4QRWGU45BWLWUZSAX}

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	2026-05-18T00:59:11.131558Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d547a608ee5f211b1a9ce86cbb533205dbe6d9e21429b2b333521a46a60a330a

Aliases

arxiv: 0912.2572 · arxiv_version: 0912.2572v1 · doi: 10.48550/arxiv.0912.2572 · pith_short_12: 2VD2MCHOL4QR · pith_short_16: 2VD2MCHOL4QRWGU4 · pith_short_8: 2VD2MCHO

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/2VD2MCHOL4QRWGU45BWLWUZSAX \
  | 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: d547a608ee5f211b1a9ce86cbb533205dbe6d9e21429b2b333521a46a60a330a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "27a50e43ff95c3cd0878ba3bbdd9156103b5480349f73ca8b5c8eb61a53d9131",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.DC",
    "submitted_at": "2009-12-14T04:01:05Z",
    "title_canon_sha256": "a46b36e14713b4a4df214049d43cd67c32a099a2e70efcb4478794013141ab84"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0912.2572",
    "kind": "arxiv",
    "version": 1
  }
}