Pith Number

pith:2USK4DRZ

pith:2018:2USK4DRZD5F7UAYSC5C4XOZGNY

not attested not anchored not stored refs pending

Automorphism groups of relatively free groups of infinite rank: a survey

V. Roman'kov

arxiv:1806.02876 v1 · 2018-06-06 · 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{2USK4DRZD5F7UAYSC5C4XOZGNY}

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	2026-05-18T00:13:54.508544Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d524ae0e391f4bfa03121745cbbb266e0b12064656d2e8406a4bd1459d0d1540

Aliases

arxiv: 1806.02876 · arxiv_version: 1806.02876v1 · doi: 10.48550/arxiv.1806.02876 · pith_short_12: 2USK4DRZD5F7 · pith_short_16: 2USK4DRZD5F7UAYS · pith_short_8: 2USK4DRZ

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/2USK4DRZD5F7UAYSC5C4XOZGNY \
  | 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: d524ae0e391f4bfa03121745cbbb266e0b12064656d2e8406a4bd1459d0d1540

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "da64d0dda71f4d80145d7ca76981e2637a5f8d9868ece4d8dfb770e02f86874d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.GR",
    "submitted_at": "2018-06-06T17:02:59Z",
    "title_canon_sha256": "375d8d9ae39450dcf81d9915a7dbedcafbfe967d9cde7c9e6d85af0cb14085f0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1806.02876",
    "kind": "arxiv",
    "version": 1
  }
}