Pith Number

pith:QQ4CWBLO

pith:2017:QQ4CWBLOELB66Z3OFWPXW45SGA

not attested not anchored not stored refs pending

Structure-preserving model reduction for marginally stable LTI systems

Kevin Carlberg, Liqian Peng

arxiv:1704.04009 v2 · 2017-04-13 · 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{QQ4CWBLOELB66Z3OFWPXW45SGA}

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	2026-05-18T00:46:00.164580Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

84382b056e22c3ef676e2d9f7b73b2301e9ba79d94d1691ea00cc9e175c5bff2

Aliases

arxiv: 1704.04009 · arxiv_version: 1704.04009v2 · doi: 10.48550/arxiv.1704.04009 · pith_short_12: QQ4CWBLOELB6 · pith_short_16: QQ4CWBLOELB66Z3O · pith_short_8: QQ4CWBLO

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/QQ4CWBLOELB66Z3OFWPXW45SGA \
  | 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: 84382b056e22c3ef676e2d9f7b73b2301e9ba79d94d1691ea00cc9e175c5bff2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e900d8a7b15b395d6e6761157333832747fea38c296c9be3dff1603a7b94bb10",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.DS",
    "submitted_at": "2017-04-13T06:38:10Z",
    "title_canon_sha256": "faa17172808b3b7dc9c0e69b0b21a456e548b9f61dfb20ce90d5b9fbaacb4eaa"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1704.04009",
    "kind": "arxiv",
    "version": 2
  }
}