Pith Number

pith:4GVCFSXX

pith:2025:4GVCFSXXY4ZKFYUMBTPEOYENOS

not attested not anchored not stored refs pending

Collect, Commit, Expand: Efficient CPQR-Based Column Selection for Extremely Wide Matrices

Anil Damle, Robin Armstrong

arxiv:2501.18035 v1 · 2025-01-29 · 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{4GVCFSXXY4ZKFYUMBTPEOYENOS}

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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	2026-07-05T10:07:06.159523Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e1aa22caf7c732a2e28c0cde47608d74a94e62904fc5268063490f25bc8592c3

Aliases

arxiv: 2501.18035 · arxiv_version: 2501.18035v1 · doi: 10.48550/arxiv.2501.18035 · pith_short_12: 4GVCFSXXY4ZK · pith_short_16: 4GVCFSXXY4ZKFYUM · pith_short_8: 4GVCFSXX

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/4GVCFSXXY4ZKFYUMBTPEOYENOS \
  | 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: e1aa22caf7c732a2e28c0cde47608d74a94e62904fc5268063490f25bc8592c3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c006d968888377790d4dd6b6713960635ea12cbde43413d7281740ccb56a34c6",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2025-01-29T22:50:51Z",
    "title_canon_sha256": "6d5287ab333a7dbe64eba3b1b0c629df1046da8a4d1a5bf7e0e6ff6e52d30614"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2501.18035",
    "kind": "arxiv",
    "version": 1
  }
}