Pith Number

pith:3BFWGUK6

pith:2017:3BFWGUK6RSFEQY7HZ6WQHSVJCI

not attested not anchored not stored refs pending

Order reduction approaches for the algebraic Riccati equation and the LQR problem

Alessandro Alla, Valeria Simoncini

arxiv:1711.01077 v1 · 2017-11-03 · math.NA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{3BFWGUK6RSFEQY7HZ6WQHSVJCI}

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	2026-05-18T00:31:23.418469Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d84b63515e8c8a4863e7cfad03caa9121ce19b830b4ddd4d9b9ce7958ccc0a19

Aliases

arxiv: 1711.01077 · arxiv_version: 1711.01077v1 · doi: 10.48550/arxiv.1711.01077 · pith_short_12: 3BFWGUK6RSFE · pith_short_16: 3BFWGUK6RSFEQY7H · pith_short_8: 3BFWGUK6

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/3BFWGUK6RSFEQY7HZ6WQHSVJCI \
  | 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: d84b63515e8c8a4863e7cfad03caa9121ce19b830b4ddd4d9b9ce7958ccc0a19

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "fc287d00303d405212861a47b65819f33f5cf04534801e2aed1eeff978b8738e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2017-11-03T09:35:20Z",
    "title_canon_sha256": "f478fb5808918890aa02a4a697a126d7c4a7a05ea5a7cda0df695315c0942498"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1711.01077",
    "kind": "arxiv",
    "version": 1
  }
}