Pith Number

pith:PPEQ2AF5

pith:2018:PPEQ2AF5VGAF75JXS3LNF62HYU

not attested not anchored not stored refs pending

A Frequency-Domain Characterization of Optimal Error Covariance for the Kalman-Bucy Filter

Hideaki Ishii, Jie Chen, Karl Henrik Johansson, Song Fang

arxiv:1807.08604 v1 · 2018-07-23 · cs.SY · cs.RO · eess.SP · 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{PPEQ2AF5VGAF75JXS3LNF62HYU}

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	2026-05-18T00:10:05.336660Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7bc90d00bda9805ff53796d6d2fb47c50d679f089af060129e5337f184648b5c

Aliases

arxiv: 1807.08604 · arxiv_version: 1807.08604v1 · doi: 10.48550/arxiv.1807.08604 · pith_short_12: PPEQ2AF5VGAF · pith_short_16: PPEQ2AF5VGAF75JX · pith_short_8: PPEQ2AF5

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/PPEQ2AF5VGAF75JXS3LNF62HYU \
  | 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: 7bc90d00bda9805ff53796d6d2fb47c50d679f089af060129e5337f184648b5c

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "72c387a5685fd7b932db97003d2f74b6af9cb241c7f538146ccfd93d966a1ed0",
    "cross_cats_sorted": [
      "cs.RO",
      "eess.SP",
      "math.OC"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.SY",
    "submitted_at": "2018-07-23T13:38:15Z",
    "title_canon_sha256": "4dce6323e63512f57c54dc66b1bd0438650f59ea0ddff311c807c923ca0afbbf"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1807.08604",
    "kind": "arxiv",
    "version": 1
  }
}