Pith Number

pith:DRA7XSLZ

pith:2011:DRA7XSLZG63LDNFCCH374AI67G

not attested not anchored not stored refs pending

Obstructing extensions of the functor Spec to noncommutative rings

Manuel L. Reyes

arxiv:1101.2239 v3 · 2011-01-11 · math.RA · math.AG · math.OA

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{DRA7XSLZG63LDNFCCH374AI67G}

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	2026-05-18T03:31:07.145635Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1c41fbc97937b6b1b4a211f7fe011ef98d6d2c35f5e2fefac08363a0930d2879

Aliases

arxiv: 1101.2239 · arxiv_version: 1101.2239v3 · doi: 10.48550/arxiv.1101.2239 · pith_short_12: DRA7XSLZG63L · pith_short_16: DRA7XSLZG63LDNFC · pith_short_8: DRA7XSLZ

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/DRA7XSLZG63LDNFCCH374AI67G \
  | 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: 1c41fbc97937b6b1b4a211f7fe011ef98d6d2c35f5e2fefac08363a0930d2879

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7c19a60f02e005221a4424548030e1a3823c1ad9726ee6a640465dc5d60094cc",
    "cross_cats_sorted": [
      "math.AG",
      "math.OA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.RA",
    "submitted_at": "2011-01-11T23:44:50Z",
    "title_canon_sha256": "4d1326d39d49c45e32fd24f96d1b874248a0ea7f140258d98d00e860e2198489"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1101.2239",
    "kind": "arxiv",
    "version": 3
  }
}