Pith Number

pith:QEGFNNGM

pith:2014:QEGFNNGMAIGA37UMG23236RY66

not attested not anchored not stored refs pending

Abelian pro-countable groups and non-Borel orbit equivalence relations

Maciej Malicki

arxiv:1405.6291 v2 · 2014-05-24 · math.LO · 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{QEGFNNGMAIGA37UMG23236RY66}

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	2026-05-18T01:16:26.783726Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

810c56b4cc020c0dfe8c36b7adfa38f7ba91ecdb33d537e09329e2b84248f2e8

Aliases

arxiv: 1405.6291 · arxiv_version: 1405.6291v2 · doi: 10.48550/arxiv.1405.6291 · pith_short_12: QEGFNNGMAIGA · pith_short_16: QEGFNNGMAIGA37UM · pith_short_8: QEGFNNGM

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/QEGFNNGMAIGA37UMG23236RY66 \
  | 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: 810c56b4cc020c0dfe8c36b7adfa38f7ba91ecdb33d537e09329e2b84248f2e8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e7d42c38ddaa0763be423c5b11e404cf38c55b6386f3aeec85216f497c026da5",
    "cross_cats_sorted": [
      "math.GR"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.LO",
    "submitted_at": "2014-05-24T10:48:43Z",
    "title_canon_sha256": "012bf4a4334393131bfed7a6cb0ebd10fc96b1e24aa5f8cfce770a9577a9697f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1405.6291",
    "kind": "arxiv",
    "version": 2
  }
}