Pith Number

pith:YBXRZXRS

pith:2013:YBXRZXRSLHKSRYIZCNR5WPTENE

not attested not anchored not stored refs pending

Low-rank Approximations for Computing Observation Impact in 4D-Var Data Assimilation

Adrian Sandu, Alexandru Cioaca

arxiv:1307.5076 v1 · 2013-07-18 · cs.CE

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{YBXRZXRSLHKSRYIZCNR5WPTENE}

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	2026-05-18T03:18:05.723934Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c06f1cde3259d528e1191363db3e646932d8f4414b7bf8969707dbfb44422075

Aliases

arxiv: 1307.5076 · arxiv_version: 1307.5076v1 · doi: 10.48550/arxiv.1307.5076 · pith_short_12: YBXRZXRSLHKS · pith_short_16: YBXRZXRSLHKSRYIZ · pith_short_8: YBXRZXRS

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/YBXRZXRSLHKSRYIZCNR5WPTENE \
  | 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: c06f1cde3259d528e1191363db3e646932d8f4414b7bf8969707dbfb44422075

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ade82d8192a7a8261481b2f111879bf120b66dc1b29158b1714950bec01d69ff",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CE",
    "submitted_at": "2013-07-18T20:34:20Z",
    "title_canon_sha256": "e316f5b24663ffe726b15d8a7d82f36a02978da5cfe79884e5de69c4f9f4a8e4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1307.5076",
    "kind": "arxiv",
    "version": 1
  }
}