Pith Number

pith:SFQTAID6

pith:2019:SFQTAID6TPDLN4IYU5OUNU36DT

not attested not anchored not stored refs pending

Weighted operator least squares problems and the J-trace in Krein spaces

Alejandra Maestripieri, Maximiliano Contino, Stefania Marcantognini

arxiv:1902.04492 v1 · 2019-02-12 · math.FA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{SFQTAID6TPDLN4IYU5OUNU36DT}

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	2026-05-17T23:54:12.160253Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

916130207e9bc6b6f118a75d46d37e1ce2191f89e09bd9d21b78318d8e0f74ab

Aliases

arxiv: 1902.04492 · arxiv_version: 1902.04492v1 · doi: 10.48550/arxiv.1902.04492 · pith_short_12: SFQTAID6TPDL · pith_short_16: SFQTAID6TPDLN4IY · pith_short_8: SFQTAID6

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/SFQTAID6TPDLN4IYU5OUNU36DT \
  | 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: 916130207e9bc6b6f118a75d46d37e1ce2191f89e09bd9d21b78318d8e0f74ab

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "935557b9873b132af7cfffc682c51a0672899c00edc13e767c54f34dc0fed776",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.FA",
    "submitted_at": "2019-02-12T16:55:50Z",
    "title_canon_sha256": "4d9e75f46b44fc0370a86c6b221898dc72e42d6a520bc7f31f54ac21dbc9eb3b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.04492",
    "kind": "arxiv",
    "version": 1
  }
}