Pith Number

pith:PPYPYNRQ

pith:1995:PPYPYNRQFSUUN2LLDGWNQSPRQT

not attested not anchored not stored refs pending

On Countably Closed Complete Boolean Algebras

Saharon Shelah, Thomas Jech

arxiv:math/9502203 v1 · 1995-02-02 · 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{PPYPYNRQFSUUN2LLDGWNQSPRQT}

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	2026-05-18T01:05:50.549786Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7bf0fc36302ca946e96b19acd849f184fa8835bbc5a04e7e8c7d5587ec1286d8

Aliases

arxiv: math/9502203 · arxiv_version: math/9502203v1 · doi: 10.48550/arxiv.math/9502203 · pith_short_12: PPYPYNRQFSUU · pith_short_16: PPYPYNRQFSUUN2LL · pith_short_8: PPYPYNRQ

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/PPYPYNRQFSUUN2LLDGWNQSPRQT \
  | 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: 7bf0fc36302ca946e96b19acd849f184fa8835bbc5a04e7e8c7d5587ec1286d8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "07a7386fddb47d6f06e84c492f5639fe5f1f4def1f04a8083a9177ccd48e02b2",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "math.LO",
    "submitted_at": "1995-02-02T00:00:00Z",
    "title_canon_sha256": "89f5df8433f184326f47321685be025681daae5fe3494cbc080fa486fe3ab77b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "math/9502203",
    "kind": "arxiv",
    "version": 1
  }
}