Pith Number

pith:ITLMRYF6

pith:2012:ITLMRYF6ASR5T7QH5VWLP6WG3E

not attested not anchored not stored refs pending

Computing the structured pseudospectrum of a Toeplitz matrix and its extreme points

Nicola Guglielmi, Paolo Butt\`a, Silvia Noschese

arxiv:1202.0254 v1 · 2012-02-01 · 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{ITLMRYF6ASR5T7QH5VWLP6WG3E}

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	2026-06-03T23:07:08.592747Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

44d6c8e0be04a3d9fe07ed6cb7fac6d904463d0570aba18fa14c6811c143f2d5

Aliases

arxiv: 1202.0254 · arxiv_version: 1202.0254v1 · doi: 10.48550/arxiv.1202.0254 · pith_short_12: ITLMRYF6ASR5 · pith_short_16: ITLMRYF6ASR5T7QH · pith_short_8: ITLMRYF6

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/ITLMRYF6ASR5T7QH5VWLP6WG3E \
  | 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: 44d6c8e0be04a3d9fe07ed6cb7fac6d904463d0570aba18fa14c6811c143f2d5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "60d64091ebc994c900ba0e23b50fedb261290b8c3f7255b64c0705067c37ef24",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2012-02-01T19:36:32Z",
    "title_canon_sha256": "7c95aa5e4380177385c682ca03754d4ea77552967794ecc934bf6038f468e330"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1202.0254",
    "kind": "arxiv",
    "version": 1
  }
}