Pith Number

pith:7EV665ON

pith:2009:7EV665ONXXVYML3NTJAETB3P4U

not attested not anchored not stored refs pending

Every central simple algebra is Hopf Schur

Ehud Meir

arxiv:1001.0157 v3 · 2009-12-31 · math.RA · math.QA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7EV665ONXXVYML3NTJAETB3P4U}

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	2026-05-18T04:06:17.845098Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f92bef75cdbdeb862f6d9a4049876fe50f8e352ed5ff7247f21f4d1aca3d01ef

Aliases

arxiv: 1001.0157 · arxiv_version: 1001.0157v3 · doi: 10.48550/arxiv.1001.0157 · pith_short_12: 7EV665ONXXVY · pith_short_16: 7EV665ONXXVYML3N · pith_short_8: 7EV665ON

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/7EV665ONXXVYML3NTJAETB3P4U \
  | 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: f92bef75cdbdeb862f6d9a4049876fe50f8e352ed5ff7247f21f4d1aca3d01ef

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "78a51bd342a200eef87726d270936ee8a970bab34520bd0b98a3370768992313",
    "cross_cats_sorted": [
      "math.QA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.RA",
    "submitted_at": "2009-12-31T17:05:55Z",
    "title_canon_sha256": "1f5b679143cec41352d89412e13765863f967e146b003d0608e0426fd9f90004"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1001.0157",
    "kind": "arxiv",
    "version": 3
  }
}