Pith Number

pith:2D55LKDG

pith:2018:2D55LKDGFICCFZ3AEWE5GJ4X36

not attested not anchored not stored refs pending

When is a matrix unitary or Hermitian plus low rank?

Federico Poloni, Gianna M. Del Corso, Leonardo Robol, Raf Vandebril

arxiv:1811.05854 v3 · 2018-11-14 · math.NA · cs.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{2D55LKDGFICCFZ3AEWE5GJ4X36}

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	2026-05-17T23:39:37.030967Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d0fbd5a8662a0422e7602589d32797dfa11eea7502a6a7bd7641a3205f8f0283

Aliases

arxiv: 1811.05854 · arxiv_version: 1811.05854v3 · doi: 10.48550/arxiv.1811.05854 · pith_short_12: 2D55LKDGFICC · pith_short_16: 2D55LKDGFICCFZ3A · pith_short_8: 2D55LKDG

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/2D55LKDGFICCFZ3AEWE5GJ4X36 \
  | 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: d0fbd5a8662a0422e7602589d32797dfa11eea7502a6a7bd7641a3205f8f0283

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "d71b7496918c664de098cdec703702b19cc1ce97d32644d577530e47f00ad1c6",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2018-11-14T15:38:25Z",
    "title_canon_sha256": "72a73960f64c594d45007c6f8470e1a73913f414045917754edbb865d37eb71b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1811.05854",
    "kind": "arxiv",
    "version": 3
  }
}