Pith Number

pith:FOP3X7M6

pith:2019:FOP3X7M6VEDG42XBDB2ZNL4MOL

not attested not anchored not stored refs pending

Low rank perturbation of regular matrix pencils with symmetry structures

Christian Mehl, Fernando De Ter\'an, Volker Mehrmann

arxiv:1902.00444 v1 · 2019-02-01 · math.SP

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{FOP3X7M6VEDG42XBDB2ZNL4MOL}

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	2026-05-17T23:54:57.465575Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2b9fbbfd9ea9066e6ae1187596af8c72cd0570b63fb692ce0f6f11b3ae7de266

Aliases

arxiv: 1902.00444 · arxiv_version: 1902.00444v1 · doi: 10.48550/arxiv.1902.00444 · pith_short_12: FOP3X7M6VEDG · pith_short_16: FOP3X7M6VEDG42XB · pith_short_8: FOP3X7M6

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/FOP3X7M6VEDG42XBDB2ZNL4MOL \
  | 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: 2b9fbbfd9ea9066e6ae1187596af8c72cd0570b63fb692ce0f6f11b3ae7de266

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3f251f35c92159aa9e3f568285e57a660661cbc84270d25c274f6a56c21f890d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.SP",
    "submitted_at": "2019-02-01T16:42:15Z",
    "title_canon_sha256": "e1879461e432846f052edbd7654d390762a3938e89403af109f4c13cc2da94e0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.00444",
    "kind": "arxiv",
    "version": 1
  }
}