Pith Number

pith:RNQRA2K7

pith:2008:RNQRA2K7IK3AAWPZIKCQO7JYU4

not attested not anchored not stored refs pending

A Sparse-Sparse Iteration for Computing a Sparse Incomplete Factorization of the Inverse of an SPD Matrix

Davod Khojasteh Salkuyeh, Faezeh Toutounian

arxiv:0807.3644 v1 · 2008-07-23 · 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{RNQRA2K7IK3AAWPZIKCQO7JYU4}

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	2026-06-03T22:06:08.282766Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8b6110695f42b60059f94285077d38a70710c85d2c29a298c99d5cbba6dddb0c

Aliases

arxiv: 0807.3644 · arxiv_version: 0807.3644v1 · doi: 10.48550/arxiv.0807.3644 · pith_short_12: RNQRA2K7IK3A · pith_short_16: RNQRA2K7IK3AAWPZ · pith_short_8: RNQRA2K7

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/RNQRA2K7IK3AAWPZIKCQO7JYU4 \
  | 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: 8b6110695f42b60059f94285077d38a70710c85d2c29a298c99d5cbba6dddb0c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5a2aada01dede348f017ce470e6c3cdd2103c6c0b9dd7184b0ef0550fbb59ebe",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2008-07-23T12:24:54Z",
    "title_canon_sha256": "e88d5e860033a41a5a1e1849c591e94f9040966cd8c03ab6221ceaffd8e896a0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0807.3644",
    "kind": "arxiv",
    "version": 1
  }
}