Pith Number

pith:OHWWUYUA

pith:2021:OHWWUYUA7LCMNBSMMJJCFUJYJT

not attested not anchored not stored refs pending

Saddle point preconditioners for weak-constraint 4D-Var

Jemima M. Tabeart, John W. Pearson

arxiv:2105.06975 v5 · 2021-05-14 · 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{OHWWUYUA7LCMNBSMMJJCFUJYJT}

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	2026-07-05T07:18:53.296117Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

71ed6a6280fac4c6864c625222d1384ce6f6fcf6920bebb7bbf813da1cc11150

Aliases

arxiv: 2105.06975 · arxiv_version: 2105.06975v5 · doi: 10.48550/arxiv.2105.06975 · pith_short_12: OHWWUYUA7LCM · pith_short_16: OHWWUYUA7LCMNBSM · pith_short_8: OHWWUYUA

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/OHWWUYUA7LCMNBSMMJJCFUJYJT \
  | 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: 71ed6a6280fac4c6864c625222d1384ce6f6fcf6920bebb7bbf813da1cc11150

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "538a10f3389337843a2f1edd6e5766a1cb88c53d35cdf4e1e756489f7eaf1571",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2021-05-14T17:29:58Z",
    "title_canon_sha256": "86dc84b480231640fbca0e5544fcf7ac39d239d65e34547358fdc0b8f9c4ebcb"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2105.06975",
    "kind": "arxiv",
    "version": 5
  }
}