Pith Number

pith:375XWM4M

pith:2013:375XWM4MVVETVAECD3M2ZWW3WH

not attested not anchored not stored refs pending

Exact sequences in the cohomology of a group extension

Johannes Huebschmann

arxiv:1303.3174 v2 · 2013-03-13 · math.GR · math.AT

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{375XWM4MVVETVAECD3M2ZWW3WH}

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	2026-05-18T00:51:30.795584Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

dffb7b338cad493a80821ed9acdadbb1f0aab88f0d4180f1b8e1c727f27db6bc

Aliases

arxiv: 1303.3174 · arxiv_version: 1303.3174v2 · doi: 10.48550/arxiv.1303.3174 · pith_short_12: 375XWM4MVVET · pith_short_16: 375XWM4MVVETVAEC · pith_short_8: 375XWM4M

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/375XWM4MVVETVAECD3M2ZWW3WH \
  | 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: dffb7b338cad493a80821ed9acdadbb1f0aab88f0d4180f1b8e1c727f27db6bc

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "bbae605bd5c572e2c35513b7b50395f58313e89261fe5bee022c7f6ab8f6adfb",
    "cross_cats_sorted": [
      "math.AT"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.GR",
    "submitted_at": "2013-03-13T14:44:13Z",
    "title_canon_sha256": "2ca553dd02a2546669b9ab7a926774813c885e68f3a38df572b52d9e0967f994"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1303.3174",
    "kind": "arxiv",
    "version": 2
  }
}