Pith Number

pith:2FDQ7CDQ

pith:2011:2FDQ7CDQPZWUK4DOIEZZFAUDHQ

not attested not anchored not stored refs pending

Extremal properties of the variance and the quantum Fisher information

Denes Petz, Geza Toth

arxiv:1109.2831 v5 · 2011-09-13 · quant-ph

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{2FDQ7CDQPZWUK4DOIEZZFAUDHQ}

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	2026-05-18T03:28:17.712490Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d1470f88707e6d45706e41339282833c26eeb04719f3e389850ac544440365ae

Aliases

arxiv: 1109.2831 · arxiv_version: 1109.2831v5 · doi: 10.48550/arxiv.1109.2831 · pith_short_12: 2FDQ7CDQPZWU · pith_short_16: 2FDQ7CDQPZWUK4DO · pith_short_8: 2FDQ7CDQ

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/2FDQ7CDQPZWUK4DOIEZZFAUDHQ \
  | 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: d1470f88707e6d45706e41339282833c26eeb04719f3e389850ac544440365ae

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "73d30a274540b640974a0476a5e033ab1d61a76d7c065b9e279016bf25796adc",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2011-09-13T15:45:43Z",
    "title_canon_sha256": "abf280aa191eff9c5a30982b6faf1a54e0d603422d0d67a4da3d51e58364b1c0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1109.2831",
    "kind": "arxiv",
    "version": 5
  }
}