Pith Number

pith:T4KRURVA

pith:2015:T4KRURVAHDWO5NMT7AATMTWMIT

not attested not anchored not stored refs pending

Rank deficiency of Kalman error covariance matrices in linear time-varying system with deterministic evolution

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

arxiv:1503.05029 v5 · 2015-03-17 · math.OC · math.DS

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{T4KRURVAHDWO5NMT7AATMTWMIT}

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	2026-05-17T23:59:39.915437Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9f151a46a038eceeb593f801364ecc44c244b726875573793fffe983e2efa9aa

Aliases

arxiv: 1503.05029 · arxiv_version: 1503.05029v5 · doi: 10.48550/arxiv.1503.05029 · pith_short_12: T4KRURVAHDWO · pith_short_16: T4KRURVAHDWO5NMT · pith_short_8: T4KRURVA

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/T4KRURVAHDWO5NMT7AATMTWMIT \
  | 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: 9f151a46a038eceeb593f801364ecc44c244b726875573793fffe983e2efa9aa

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7c761afcebf3e679f3f714efdf4a5d8155b7a14fd3e2f7c5fd5818472ea99870",
    "cross_cats_sorted": [
      "math.DS"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2015-03-17T13:08:46Z",
    "title_canon_sha256": "4f06da870d568f4d4b83aa2fbf6355c9390045fa4a6e2e8e2dd22ea1df66e99d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1503.05029",
    "kind": "arxiv",
    "version": 5
  }
}