Pith Number

pith:PA2L3PNL

pith:2016:PA2L3PNL5AM5SSOPXCFHBYREGU

not attested not anchored not stored refs pending

Degenerate Kalman filter error covariances and their convergence onto the unstable subspace

Alberto Carrassi, Amit Apte, Christopher K. R. T. Jones, Colin Grudzien, Karthik S. Gurumoorthy, Marc Bocquet

arxiv:1604.02578 v3 · 2016-04-09 · 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{PA2L3PNL5AM5SSOPXCFHBYREGU}

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	2026-05-18T00:47:33.823610Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7834bdbdabe819d949cfb88a70e224351d586996a98b985515e25a440617a56a

Aliases

arxiv: 1604.02578 · arxiv_version: 1604.02578v3 · doi: 10.48550/arxiv.1604.02578 · pith_short_12: PA2L3PNL5AM5 · pith_short_16: PA2L3PNL5AM5SSOP · pith_short_8: PA2L3PNL

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/PA2L3PNL5AM5SSOPXCFHBYREGU \
  | 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: 7834bdbdabe819d949cfb88a70e224351d586996a98b985515e25a440617a56a

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "c989f7c67a826b116e2b995a5017f59e7abce473b763aa223ed1e3b124850bc3",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2016-04-09T17:02:11Z",
    "title_canon_sha256": "2073426bee5fa035751e47e24298f9946e5a039a3051886e59db2c7c29cd0376"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1604.02578",
    "kind": "arxiv",
    "version": 3
  }
}