Pith Number

pith:CSY5NNSB

pith:2014:CSY5NNSBOTGHRY4ZEBHABRRGQN

not attested not anchored not stored refs pending

A Kalman filter powered by $\mathcal{H}^2$-matrices for quasi-continuous data assimilation problems

Eric F. Darve, Judith Y. Li, Peter K. Kitanidis, Sivaram Ambikasaran

arxiv:1404.3816 v1 · 2014-04-15 · math.NA · cs.NA · stat.CO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{CSY5NNSBOTGHRY4ZEBHABRRGQN}

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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	2026-05-18T01:43:34.631160Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

14b1d6b64174cc78e399204e00c6268370bc2361c5fc43655e319a4167d6832a

Aliases

arxiv: 1404.3816 · arxiv_version: 1404.3816v1 · doi: 10.48550/arxiv.1404.3816 · pith_short_12: CSY5NNSBOTGH · pith_short_16: CSY5NNSBOTGHRY4Z · pith_short_8: CSY5NNSB

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/CSY5NNSBOTGHRY4ZEBHABRRGQN \
  | 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: 14b1d6b64174cc78e399204e00c6268370bc2361c5fc43655e319a4167d6832a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "083f143fcaa96f3158d49e2b6ed5573719b110d2be9ab41971285008ff980ba7",
    "cross_cats_sorted": [
      "cs.NA",
      "stat.CO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2014-04-15T04:43:03Z",
    "title_canon_sha256": "4b5331ba3051be802a1f88ea13b9849885cc1c5cf435436a62e70318518d2742"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1404.3816",
    "kind": "arxiv",
    "version": 1
  }
}