Pith Number

pith:OGYQUZXO

pith:2011:OGYQUZXOR2DROP5N3NY7JTTKPA

not attested not anchored not stored refs pending

The Euler characteristics of categories and the barycentric subdivision

Kazunori Noguchi

arxiv:1104.3630 v2 · 2011-04-19 · math.CT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{OGYQUZXOR2DROP5N3NY7JTTKPA}

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	2026-05-18T04:22:31.662669Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

71b10a66ee8e87173faddb71f4ce6a7805f19a786be27afd9b40953d43717506

Aliases

arxiv: 1104.3630 · arxiv_version: 1104.3630v2 · doi: 10.48550/arxiv.1104.3630 · pith_short_12: OGYQUZXOR2DR · pith_short_16: OGYQUZXOR2DROP5N · pith_short_8: OGYQUZXO

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/OGYQUZXOR2DROP5N3NY7JTTKPA \
  | 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: 71b10a66ee8e87173faddb71f4ce6a7805f19a786be27afd9b40953d43717506

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2f4ee6383f18e475d23e97f37fc4c7289515c64992991b4c9bf3d41c53d65f4e",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CT",
    "submitted_at": "2011-04-19T03:38:13Z",
    "title_canon_sha256": "397e978cdd7c32a098e1bca48db7ca7e8579bd86713dc9a220eda821f7eca811"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1104.3630",
    "kind": "arxiv",
    "version": 2
  }
}