Pith Number

pith:ZOBOC4IK

pith:2011:ZOBOC4IKU45RWICS2UFLL6GRGP

not attested not anchored not stored refs pending

Amalgams of inverse semigroups and reversible two-counter machines

Emanuele Rodaro, Pedro V. Silva

arxiv:1105.1905 v1 · 2011-05-10 · 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{ZOBOC4IKU45RWICS2UFLL6GRGP}

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	2026-05-18T03:28:56.500358Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

cb82e1710aa73b1b2052d50ab5f8d133cff0f7d7f8e9a3e62b23f34be40ff4a1

Aliases

arxiv: 1105.1905 · arxiv_version: 1105.1905v1 · doi: 10.48550/arxiv.1105.1905 · pith_short_12: ZOBOC4IKU45R · pith_short_16: ZOBOC4IKU45RWICS · pith_short_8: ZOBOC4IK

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/ZOBOC4IKU45RWICS2UFLL6GRGP \
  | 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: cb82e1710aa73b1b2052d50ab5f8d133cff0f7d7f8e9a3e62b23f34be40ff4a1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "078747cff85790f977128f46f61b18032a565b9ac3dd104d3c178b3da0d7a1c6",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.GR",
    "submitted_at": "2011-05-10T10:50:31Z",
    "title_canon_sha256": "7cbd0eb218414123dc9dc5a4e22e205721dd2b2b2b19f40d12eac966c195e3e5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1105.1905",
    "kind": "arxiv",
    "version": 1
  }
}