Pith Number

pith:SGUCABP7

pith:2019:SGUCABP7WKZY44WG7XJWO7XXZT

not attested not anchored not stored refs pending

Taming Koepke's Zoo II: Register Machines

Merlin Carl

arxiv:1907.09513 v8 · 2019-07-22 · math.LO

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{SGUCABP7WKZY44WG7XJWO7XXZT}

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.

Cited by

1 paper in Pith

Lower bounds on $\beta(\alpha)$ and other properties of $\alpha$-ITRMs

Receipt and verification

First computed	2026-05-20T00:05:23.516066Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

91a82005ffb2b38e72c6fdd3677ef7ccd6f940a770124d29b8430cbf4f1c4764

Aliases

arxiv: 1907.09513 · arxiv_version: 1907.09513v8 · doi: 10.48550/arxiv.1907.09513 · pith_short_12: SGUCABP7WKZY · pith_short_16: SGUCABP7WKZY44WG · pith_short_8: SGUCABP7

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/SGUCABP7WKZY44WG7XJWO7XXZT \
  | 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: 91a82005ffb2b38e72c6fdd3677ef7ccd6f940a770124d29b8430cbf4f1c4764

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4696be739223a7112894c742e4cdbb111b49a24b706cff7231de0c76137c55fb",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.LO",
    "submitted_at": "2019-07-22T18:26:34Z",
    "title_canon_sha256": "20bd3b03062bd8b859964d97bc18d161dca6f67c311117e8f581d0a987a69bea"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1907.09513",
    "kind": "arxiv",
    "version": 8
  }
}