Pith Number

pith:4GGDQKQ2

pith:2014:4GGDQKQ24XOXUQ7ZEVB5KWHIFH

not attested not anchored not stored refs pending

SPSD Matrix Approximation vis Column Selection: Theories, Algorithms, and Extensions

Luo Luo, Shusen Wang, Zhihua Zhang

arxiv:1406.5675 v6 · 2014-06-22 · cs.LG

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{4GGDQKQ24XOXUQ7ZEVB5KWHIFH}

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	2026-05-18T01:14:26.305346Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e18c382a1ae5dd7a43f92543d558e829d16a0069bf42fa952ca5ee130f86ab05

Aliases

arxiv: 1406.5675 · arxiv_version: 1406.5675v6 · doi: 10.48550/arxiv.1406.5675 · pith_short_12: 4GGDQKQ24XOX · pith_short_16: 4GGDQKQ24XOXUQ7Z · pith_short_8: 4GGDQKQ2

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/4GGDQKQ24XOXUQ7ZEVB5KWHIFH \
  | 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: e18c382a1ae5dd7a43f92543d558e829d16a0069bf42fa952ca5ee130f86ab05

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ffa2cc6f68c14c85b34f1b1676d533abdf966597b115556897b4c4fb44135739",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LG",
    "submitted_at": "2014-06-22T05:02:06Z",
    "title_canon_sha256": "1762c45dfe54cfad99840697a640bd098a3b6db6af38fa104713b82c8a0c2d87"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1406.5675",
    "kind": "arxiv",
    "version": 6
  }
}