Pith Number

pith:KQP2A55F

pith:2015:KQP2A55FDIRZLBNUCDNUBDCTWA

not attested not anchored not stored refs pending

A Time-parallel Approach to Strong-constraint Four-dimensional Variational Data Assimilation

Adrian Sandu, Vishwas Rao

arxiv:1505.04515 v1 · 2015-05-18 · cs.NA · 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{KQP2A55FDIRZLBNUCDNUBDCTWA}

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	2026-05-18T01:16:50.545983Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

541fa077a51a239585b410db408c53b00e1c1c99965437b9081288ea8f84c0cb

Aliases

arxiv: 1505.04515 · arxiv_version: 1505.04515v1 · doi: 10.48550/arxiv.1505.04515 · pith_short_12: KQP2A55FDIRZ · pith_short_16: KQP2A55FDIRZLBNU · pith_short_8: KQP2A55F

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/KQP2A55FDIRZLBNUCDNUBDCTWA \
  | 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: 541fa077a51a239585b410db408c53b00e1c1c99965437b9081288ea8f84c0cb

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dc1122c252bdaf1a576a66b0b9b3d57990fbf66c057aa4f65293251fe71ee391",
    "cross_cats_sorted": [
      "math.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.NA",
    "submitted_at": "2015-05-18T05:33:50Z",
    "title_canon_sha256": "7dc92ebe1d23a254d324ef4ff13d77966bb0cca3413c3b0019b2798b02c3a11e"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1505.04515",
    "kind": "arxiv",
    "version": 1
  }
}