Pith Number

pith:YI6WEJOJ

pith:2019:YI6WEJOJJF67ZK2U4HBOOBHMJM

not attested not anchored not stored refs pending

NNIL-formulas revisited: universal models and finite model property

Dick de Jongh, Fan Yang, Julia Ilin

arxiv:1908.01635 v2 · 2019-08-05 · 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{YI6WEJOJJF67ZK2U4HBOOBHMJM}

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	2026-07-05T01:29:00.471252Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c23d6225c9497dfcab54e1c2e704ec4b12a48815befa29c571359c40760aee58

Aliases

arxiv: 1908.01635 · arxiv_version: 1908.01635v2 · doi: 10.48550/arxiv.1908.01635 · pith_short_12: YI6WEJOJJF67 · pith_short_16: YI6WEJOJJF67ZK2U · pith_short_8: YI6WEJOJ

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/YI6WEJOJJF67ZK2U4HBOOBHMJM \
  | 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: c23d6225c9497dfcab54e1c2e704ec4b12a48815befa29c571359c40760aee58

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2bd1cb4d00a7f518b0758625da9f11fb5b6001cd6979a05611671d113bb6940c",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.LO",
    "submitted_at": "2019-08-05T14:10:13Z",
    "title_canon_sha256": "1c3ada490f4495fdae9265e6a75452bc55d4e5b64748dd72602dd6449607e7b9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1908.01635",
    "kind": "arxiv",
    "version": 2
  }
}