Pith Number

pith:EKDZI4VH

pith:2011:EKDZI4VHEDYNKP66BRVM4OROA2

not attested not anchored not stored refs pending

A characterization of adequate semigroups by forbidden subsemigroups

Antonio Malheiro, Joao Araujo, Michael Kinyon

arxiv:1111.4512 v1 · 2011-11-18 · 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{EKDZI4VHEDYNKP66BRVM4OROA2}

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	2026-05-18T00:41:54.167883Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

22879472a720f0d53fde0c6ace3a2e06b1f4b691dd8a08a0a9efc6e21114a61d

Aliases

arxiv: 1111.4512 · arxiv_version: 1111.4512v1 · doi: 10.48550/arxiv.1111.4512 · pith_short_12: EKDZI4VHEDYN · pith_short_16: EKDZI4VHEDYNKP66 · pith_short_8: EKDZI4VH

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/EKDZI4VHEDYNKP66BRVM4OROA2 \
  | 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: 22879472a720f0d53fde0c6ace3a2e06b1f4b691dd8a08a0a9efc6e21114a61d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "cbb5a0b66cfbddb66a6876b038dc4d36ae72f2260fe97d360d617175f7b33dbf",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.GR",
    "submitted_at": "2011-11-18T22:53:11Z",
    "title_canon_sha256": "605194d655005686c6730e7e3aebd1a517c7045304ff6a5416ff366bc6918816"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1111.4512",
    "kind": "arxiv",
    "version": 1
  }
}