Pith Number

pith:RJQC4YFY

pith:2015:RJQC4YFYPINWEDVGYXUL44FUCW

not attested not anchored not stored refs pending

The uniqueness-of-norm problem for Calkin algebras

Richard Skillicorn

arxiv:1507.08118 v1 · 2015-07-29 · 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{RJQC4YFYPINWEDVGYXUL44FUCW}

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	2026-05-18T01:20:50.410997Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8a602e60b87a1b620ea6c5e8be70b415ad6c723285c8d5e8587c5ef31cea1121

Aliases

arxiv: 1507.08118 · arxiv_version: 1507.08118v1 · doi: 10.48550/arxiv.1507.08118 · pith_short_12: RJQC4YFYPINW · pith_short_16: RJQC4YFYPINWEDVG · pith_short_8: RJQC4YFY

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/RJQC4YFYPINWEDVGYXUL44FUCW \
  | 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: 8a602e60b87a1b620ea6c5e8be70b415ad6c723285c8d5e8587c5ef31cea1121

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4b830020a724cbff72f75cb7124c2c8eaef914510690a43f0f47bbefbe52fa2b",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.FA",
    "submitted_at": "2015-07-29T12:41:30Z",
    "title_canon_sha256": "03668985272cd4a18c456f7ecde9d43bb7dae6db44ef3125c5cc43df5a3a1594"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1507.08118",
    "kind": "arxiv",
    "version": 1
  }
}