Pith Number

pith:FUVSA7XT

pith:2013:FUVSA7XTGYYYXFC27ZXN6SVFC2

not attested not anchored not stored refs pending

Subspace-preserving sparsification of matrices with minimal perturbation to the near null-space. Part I: Basics

Chetan Jhurani

arxiv:1304.7049 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{FUVSA7XTGYYYXFC27ZXN6SVFC2}

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	2026-05-18T03:27:02.720568Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2d2b207ef336318b945afe6edf4aa516b6244c45360498389e628e479942e30e

Aliases

arxiv: 1304.7049 · arxiv_version: 1304.7049v1 · doi: 10.48550/arxiv.1304.7049 · pith_short_12: FUVSA7XTGYYY · pith_short_16: FUVSA7XTGYYYXFC2 · pith_short_8: FUVSA7XT

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/FUVSA7XTGYYYXFC27ZXN6SVFC2 \
  | 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: 2d2b207ef336318b945afe6edf4aa516b6244c45360498389e628e479942e30e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "32f9040f3f048c4dd6c0e7c09acdf90ae7d014df5c75378de5ab2fecf35d7b02",
    "cross_cats_sorted": [
      "cs.MS"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2013-04-26T01:43:09Z",
    "title_canon_sha256": "f0cb2ecdcbebb7c9e752c25bfafbbabd32f996e8ab5bc4a41c3f83935ef84016"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1304.7049",
    "kind": "arxiv",
    "version": 1
  }
}