Pith Number

pith:WU5M2NRL

pith:2015:WU5M2NRLADRC57DY6GDLTUKHAV

not attested not anchored not stored refs pending

Ensemble Kalman Filter Implementations Based on Covariance Matrix Estimation

Adrian Sandu, Elias D. Nino-Ruiz

arxiv:1502.00301 v1 · 2015-02-01 · math.ST · stat.TH

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{WU5M2NRLADRC57DY6GDLTUKHAV}

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	2026-05-18T02:28:06.268955Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b53acd362b00e22efc78f186b9d1470578cdb68c1522090300e384449a3d4bf3

Aliases

arxiv: 1502.00301 · arxiv_version: 1502.00301v1 · doi: 10.48550/arxiv.1502.00301 · pith_short_12: WU5M2NRLADRC · pith_short_16: WU5M2NRLADRC57DY · pith_short_8: WU5M2NRL

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/WU5M2NRLADRC57DY6GDLTUKHAV \
  | 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: b53acd362b00e22efc78f186b9d1470578cdb68c1522090300e384449a3d4bf3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a052156131064fe0eb2f98c4f4b2a3e7dbbc5b6f9d11b4b0838349909993db75",
    "cross_cats_sorted": [
      "stat.TH"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.ST",
    "submitted_at": "2015-02-01T19:37:38Z",
    "title_canon_sha256": "36dab928712ba43956c431fcc2d55d2c8001efff8bdf9e4b942bb8a249ca12b9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1502.00301",
    "kind": "arxiv",
    "version": 1
  }
}