Pith Number

pith:YIYJ5SZ4

pith:2025:YIYJ5SZ4LDPMSZZBKTU2626DRF

not attested not anchored not stored refs pending

State-dependent preconditioning for the inner-loop in Variational Data Assimilation using Machine Learning

Arthur Vidard (AIRSEA), ICJ, PSPM), Victor Trappler (AIRSEA

arxiv:2501.04369 v1 · 2025-01-08 · math.OC

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{YIYJ5SZ4LDPMSZZBKTU2626DRF}

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.

Cited by

1 paper in Pith

An Introduction to Solving the Least-Squares Problem in Variational Data Assimilation

Receipt and verification

First computed	2026-07-05T09:58:33.914100Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c2309ecb3c58dec9672154e9af6bc38978e24c617017e2fd8a4c64f277c709de

Aliases

arxiv: 2501.04369 · arxiv_version: 2501.04369v1 · doi: 10.48550/arxiv.2501.04369 · pith_short_12: YIYJ5SZ4LDPM · pith_short_16: YIYJ5SZ4LDPMSZZB · pith_short_8: YIYJ5SZ4

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/YIYJ5SZ4LDPMSZZBKTU2626DRF \
  | 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: c2309ecb3c58dec9672154e9af6bc38978e24c617017e2fd8a4c64f277c709de

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0dcd8a203e7ee679f132e99e89bd8e85dfd7f951336ce86a20a3a7c3ece2bacd",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2025-01-08T09:16:03Z",
    "title_canon_sha256": "89f9ad6e34a60d7caef63b62a79ab96ec1005e29825f19534801fe3cd99c10f0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2501.04369",
    "kind": "arxiv",
    "version": 1
  }
}