Pith Number

pith:ODGU52QR

pith:2019:ODGU52QRT7SXNHCYCI7YE6F5PG

not attested not anchored not stored refs pending

All those EPPA classes (Strengthenings of the Herwig-Lascar theorem)

Jan Hubi\v{c}ka, Jaroslav Ne\v{s}et\v{r}il, Mat\v{e}j Kone\v{c}n\'y

arxiv:1902.03855 v4 · 2019-02-11 · math.CO · cs.DM · math.GR · 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{ODGU52QRT7SXNHCYCI7YE6F5PG}

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

Merges of Smooth Classes and Their Properties

Receipt and verification

First computed	2026-07-05T03:50:45.460212Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

70cd4eea119fe5769c58123f8278bd7994de98ca6948c84d9d19c049862a2864

Aliases

arxiv: 1902.03855 · arxiv_version: 1902.03855v4 · doi: 10.48550/arxiv.1902.03855 · pith_short_12: ODGU52QRT7SX · pith_short_16: ODGU52QRT7SXNHCY · pith_short_8: ODGU52QR

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/ODGU52QRT7SXNHCYCI7YE6F5PG \
  | 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: 70cd4eea119fe5769c58123f8278bd7994de98ca6948c84d9d19c049862a2864

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "42c91a7bfef8afbf8df1d06de92a48a1b4f35d0c47b3f6ebc188a3e56365e5d4",
    "cross_cats_sorted": [
      "cs.DM",
      "math.GR",
      "math.LO"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.CO",
    "submitted_at": "2019-02-11T13:10:55Z",
    "title_canon_sha256": "9ffecbddd54874d12a2f9a78728230cf53c963b9be0178e27d9cbfd402f720c5"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1902.03855",
    "kind": "arxiv",
    "version": 4
  }
}