Pith Number

pith:NQXQTL4Y

pith:2019:NQXQTL4YLAMFX5TME2QNA5RZPR

not attested not anchored not stored refs pending

Perturbations of CUR Decompositions

Keaton Hamm, Longxiu Huang

arxiv:1908.08101 v2 · 2019-08-21 · 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{NQXQTL4YLAMFX5TME2QNA5RZPR}

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	2026-07-05T01:22:36.034887Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6c2f09af9858185bf66c26a0d076397c4e9aed8b711d00e79e701a5c58f8e5ce

Aliases

arxiv: 1908.08101 · arxiv_version: 1908.08101v2 · doi: 10.48550/arxiv.1908.08101 · pith_short_12: NQXQTL4YLAMF · pith_short_16: NQXQTL4YLAMFX5TM · pith_short_8: NQXQTL4Y

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/NQXQTL4YLAMFX5TME2QNA5RZPR \
  | 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: 6c2f09af9858185bf66c26a0d076397c4e9aed8b711d00e79e701a5c58f8e5ce

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c24d007035a7464cc1d768d4b8b3857922aea47d9422372f9b8b41ad2e65d283",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2019-08-21T20:06:43Z",
    "title_canon_sha256": "031af82c0e8b85112c0fe7fd55e301d033b6560efa629c46db23dc98567b97ff"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1908.08101",
    "kind": "arxiv",
    "version": 2
  }
}