Pith Number

pith:7EIUPK4O

pith:2019:7EIUPK4OBMVUBTKALCGRAY4K4J

not attested not anchored not stored refs pending

Automorphism towers of groups of homeomorphisms of Cantor space

Feyishayo Olukoya

arxiv:1908.03815 v2 · 2019-08-10 · math.GR

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7EIUPK4OBMVUBTKALCGRAY4K4J}

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	2026-07-05T01:28:17.784775Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

f91147ab8e0b2b40cd40588d10638ae243498c7404e4ebe83eb7aecfd1ff28ea

Aliases

arxiv: 1908.03815 · arxiv_version: 1908.03815v2 · doi: 10.48550/arxiv.1908.03815 · pith_short_12: 7EIUPK4OBMVU · pith_short_16: 7EIUPK4OBMVUBTKA · pith_short_8: 7EIUPK4O

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/7EIUPK4OBMVUBTKALCGRAY4K4J \
  | 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: f91147ab8e0b2b40cd40588d10638ae243498c7404e4ebe83eb7aecfd1ff28ea

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6d184422ad5a4209b54071869bbf084bf84b9392c35bee52a41a1b61401181a7",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.GR",
    "submitted_at": "2019-08-10T21:53:08Z",
    "title_canon_sha256": "d54201efd79fe8addcb4e953441708665521f949aa2e8bcd437d8d814a08aa90"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1908.03815",
    "kind": "arxiv",
    "version": 2
  }
}