Pith Number

pith:BL2OBUCC

pith:2004:BL2OBUCCQDEWEMPYGDFW5AEVNG

not attested not anchored not stored refs pending

Regular algebras of dimension 4 and their A-infinity Ext-algebras

D.-M. Lu, J. H. Palmieri, J. J. Zhang, Q.-S. Wu

arxiv:math/0411497 v1 · 2004-11-22 · 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{BL2OBUCCQDEWEMPYGDFW5AEVNG}

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	2026-07-04T14:39:23.890132Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

0af4e0d04280c96231f830cb6e8095699554848d60c2ee1ac9b4c8f08a08549f

Aliases

arxiv: math/0411497 · arxiv_version: math/0411497v1 · doi: 10.48550/arxiv.math/0411497 · pith_short_12: BL2OBUCCQDEW · pith_short_16: BL2OBUCCQDEWEMPY · pith_short_8: BL2OBUCC

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/BL2OBUCCQDEWEMPYGDFW5AEVNG \
  | 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: 0af4e0d04280c96231f830cb6e8095699554848d60c2ee1ac9b4c8f08a08549f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "a0ae961517d8629e09297c48965b7226b9cb372c09cc2b1842b70d23838ec46d",
    "cross_cats_sorted": [
      "math.QA"
    ],
    "license": "",
    "primary_cat": "math.RA",
    "submitted_at": "2004-11-22T21:05:33Z",
    "title_canon_sha256": "5cd34dd89ab1b4aed2ea2786fab604e3b088d7418e275bfbe3a2048e5cef5bd4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "math/0411497",
    "kind": "arxiv",
    "version": 1
  }
}