Pith Number

pith:OQ3UGQTU

pith:2012:OQ3UGQTUMQBBVV5HQBABKZ4UCJ

not attested not anchored not stored refs pending

A Combined Preconditioning Strategy for Nonsymmetric Systems

Andrew T. Barker, Blanca Ayuso De Dios, Panayot S. Vassilevski

arxiv:1208.4544 v2 · 2012-08-22 · 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{OQ3UGQTUMQBBVV5HQBABKZ4UCJ}

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	2026-05-18T02:43:54.488431Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

743743427464021ad7a7804015679412625ac0446e0d786a90406dbf12837ffb

Aliases

arxiv: 1208.4544 · arxiv_version: 1208.4544v2 · doi: 10.48550/arxiv.1208.4544 · pith_short_12: OQ3UGQTUMQBB · pith_short_16: OQ3UGQTUMQBBVV5H · pith_short_8: OQ3UGQTU

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/OQ3UGQTUMQBBVV5HQBABKZ4UCJ \
  | 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: 743743427464021ad7a7804015679412625ac0446e0d786a90406dbf12837ffb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0554e27e36ea8884aff817252c120771bf23b6109a66e1a1b48e794678a88dbc",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2012-08-22T16:10:59Z",
    "title_canon_sha256": "0e76b937e89c1694549e3af0c1b0703dbe3b194bf1ed12fa8ab3dbcf4439aabe"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1208.4544",
    "kind": "arxiv",
    "version": 2
  }
}