Pith Number

pith:Q666YEHY

pith:2021:Q666YEHYJQWBMYPCOS6RHZLLE5

not attested not anchored not stored refs pending

State Observation of Affine-in-the-States Systems with Unknown Time-Varying Parameters and Output Delay

Alexey Bobtsov, Denis Efimov, Nikolay Nikolaev, Olga Kozachek, Romeo Ortega

arxiv:2112.02939 v1 · 2021-12-06 · 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{Q666YEHYJQWBMYPCOS6RHZLLE5}

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	2026-07-05T03:37:59.596656Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

87bdec10f84c2c1661e274bd13e56b2778e584d9f9353ace9d5978310f06e86d

Aliases

arxiv: 2112.02939 · arxiv_version: 2112.02939v1 · doi: 10.48550/arxiv.2112.02939 · pith_short_12: Q666YEHYJQWB · pith_short_16: Q666YEHYJQWBMYPC · pith_short_8: Q666YEHY

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/Q666YEHYJQWBMYPCOS6RHZLLE5 \
  | 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: 87bdec10f84c2c1661e274bd13e56b2778e584d9f9353ace9d5978310f06e86d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "34589dfffe82b47d88da1e6cfb42934af748de1ea2cac6b94ebaee44898c55a6",
    "cross_cats_sorted": [
      "math.DS"
    ],
    "license": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
    "primary_cat": "math.OC",
    "submitted_at": "2021-12-06T11:19:45Z",
    "title_canon_sha256": "1217892b2a3de7efa2f2e51337ab62c2cdd747dbf3e903e369966e4e9c4ad9c4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2112.02939",
    "kind": "arxiv",
    "version": 1
  }
}