Pith Number

pith:5GRIMGFN

pith:2025:5GRIMGFNUMPGW53H46IIGOHCLJ

not attested not anchored not stored refs pending

Efficient QR-based Column Subset Selection through Randomized Sparse Embeddings

Israa Fakih, Laura Grigori

arxiv:2509.03198 v2 · 2025-09-03 · 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{5GRIMGFNUMPGW53H46IIGOHCLJ}

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	2026-07-05T12:04:41.424366Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e9a28618ada31e6b7767e7908338e25a66d8e91c24a7c963ee567ec144446281

Aliases

arxiv: 2509.03198 · arxiv_version: 2509.03198v2 · doi: 10.48550/arxiv.2509.03198 · pith_short_12: 5GRIMGFNUMPG · pith_short_16: 5GRIMGFNUMPGW53H · pith_short_8: 5GRIMGFN

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/5GRIMGFNUMPGW53H46IIGOHCLJ \
  | 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: e9a28618ada31e6b7767e7908338e25a66d8e91c24a7c963ee567ec144446281

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cfbb57c844f3c2ba4e84a071362335cf38c8cf7ac8a833a570ca60788a88adf8",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2025-09-03T10:34:28Z",
    "title_canon_sha256": "ddd9c38cc34f54b7d11b4e60778620df2d80d9980c596a584b0103367cfe777b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2509.03198",
    "kind": "arxiv",
    "version": 2
  }
}