Pith Number

pith:MBSWWBCO

pith:2013:MBSWWBCO7GGBSAR6XPNH5UCM5F

not attested not anchored not stored refs pending

Subspace-preserving sparsification of matrices with minimal perturbation to the near null-space. Part II: Approximation and Implementation

Chetan Jhurani

arxiv:1304.7050 v1 · 2013-04-26 · math.NA · cs.MS

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{MBSWWBCO7GGBSAR6XPNH5UCM5F}

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	2026-05-18T03:27:02.712597Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

60656b044ef98c19023ebbda7ed04ce944157bc979856c10143af489276c70f7

Aliases

arxiv: 1304.7050 · arxiv_version: 1304.7050v1 · doi: 10.48550/arxiv.1304.7050 · pith_short_12: MBSWWBCO7GGB · pith_short_16: MBSWWBCO7GGBSAR6 · pith_short_8: MBSWWBCO

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/MBSWWBCO7GGBSAR6XPNH5UCM5F \
  | 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: 60656b044ef98c19023ebbda7ed04ce944157bc979856c10143af489276c70f7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "08010519e8d2df34e3fdb481da4d31f8fb35b26dfc5668001f0ff977699cb34e",
    "cross_cats_sorted": [
      "cs.MS"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2013-04-26T01:44:09Z",
    "title_canon_sha256": "f8c20c9f1b3c2a75b2e2691ce40f04c1e87824f8a242c3b078c192e60b7e378a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1304.7050",
    "kind": "arxiv",
    "version": 1
  }
}