Pith Number

pith:EMY3PR7X

pith:2015:EMY3PR7XOQ5AJBM5LYKDF3UKLR

not attested not anchored not stored refs pending

Geometrical inverse preconditioning for symmetric positive definite matrices

Jean-Paul Chehab, Marcos Raydan

arxiv:1511.07694 v1 · 2015-11-24 · math.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{EMY3PR7XOQ5AJBM5LYKDF3UKLR}

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	2026-05-18T01:26:03.948226Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2331b7c7f7743a04859d5e1432ee8a5c43ff3f8804c0a6d59778fa248168ded0

Aliases

arxiv: 1511.07694 · arxiv_version: 1511.07694v1 · doi: 10.48550/arxiv.1511.07694 · pith_short_12: EMY3PR7XOQ5A · pith_short_16: EMY3PR7XOQ5AJBM5 · pith_short_8: EMY3PR7X

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/EMY3PR7XOQ5AJBM5LYKDF3UKLR \
  | 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: 2331b7c7f7743a04859d5e1432ee8a5c43ff3f8804c0a6d59778fa248168ded0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6f39dabe31ec71cea1ad6af88352853cf5b1b4842b6b7db9a267aa7112a4429e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2015-11-24T13:20:47Z",
    "title_canon_sha256": "e39f14076b041ac606f8ce04e3f7aea966ffa401cdb595f2d408503fcc6d9f4a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1511.07694",
    "kind": "arxiv",
    "version": 1
  }
}