Pith Number

pith:X6JHD4ZS

pith:2025:X6JHD4ZSRS3N6R4ACMC7LUNFKJ

not attested not anchored not stored refs pending

Randomized strong rank-revealing QR for column subset selection and low-rank matrix approximation

Laura Grigori, Zhipeng Xue

arxiv:2503.18496 v1 · 2025-03-24 · 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{X6JHD4ZSRS3N6R4ACMC7LUNFKJ}

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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

Many (most?) column subset selection criteria are NP hard for a few columns

Receipt and verification

First computed	2026-07-05T10:38:11.908920Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bf9271f3328cb6df47801305f5d1a5524b7dbbd805936b1df45953145bcc8cbb

Aliases

arxiv: 2503.18496 · arxiv_version: 2503.18496v1 · doi: 10.48550/arxiv.2503.18496 · pith_short_12: X6JHD4ZSRS3N · pith_short_16: X6JHD4ZSRS3N6R4A · pith_short_8: X6JHD4ZS

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/X6JHD4ZSRS3N6R4ACMC7LUNFKJ \
  | 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: bf9271f3328cb6df47801305f5d1a5524b7dbbd805936b1df45953145bcc8cbb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7fc399da659ee5c59ab0641000b2339d8d4c1bed1ec9abc6803d12ac7d769fd2",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2025-03-24T09:52:06Z",
    "title_canon_sha256": "d396baf90d088cd5a6464d43f009a335a29a73ab495f74cbb5b2719e14acb02e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2503.18496",
    "kind": "arxiv",
    "version": 1
  }
}