Pith Number

pith:QVNDIXQY

pith:2014:QVNDIXQYTQNNMSVVB3HNO4GVK2

not attested not anchored not stored refs pending

Fejer's approximation of continuous functions of unitary operators

Krzysztof Zajkowski

arxiv:1403.1979 v1 · 2014-03-08 · 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{QVNDIXQYTQNNMSVVB3HNO4GVK2}

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	2026-05-18T02:56:51.146449Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

855a345e189c1ad64ab50eced770d556a10ba502f31ad3608e6df8648370adc8

Aliases

arxiv: 1403.1979 · arxiv_version: 1403.1979v1 · doi: 10.48550/arxiv.1403.1979 · pith_short_12: QVNDIXQYTQNN · pith_short_16: QVNDIXQYTQNNMSVV · pith_short_8: QVNDIXQY

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/QVNDIXQYTQNNMSVVB3HNO4GVK2 \
  | 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: 855a345e189c1ad64ab50eced770d556a10ba502f31ad3608e6df8648370adc8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "edffb2865e1d1d22313b3afeb384edbe50128fdfab19f4db692159e51775a808",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.FA",
    "submitted_at": "2014-03-08T15:43:40Z",
    "title_canon_sha256": "12a11bc8b06641c75dae437ef4b0d6a6b327ea0634057cd0d38187ebb5673398"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1403.1979",
    "kind": "arxiv",
    "version": 1
  }
}