Pith Number

pith:MYPKQTLZ

pith:1993:MYPKQTLZUPWSVE2NVUH2RSEREU

not attested not anchored not stored refs pending

Forcing isomorphism

John T. Baldwin, Michael C. Laskowski, Saharon Shelah

arxiv:math/9301208 v1 · 1993-01-15 · 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{MYPKQTLZUPWSVE2NVUH2RSEREU}

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	2026-05-18T01:05:52.385527Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

661ea84d79a3ed2a934dad0fa8c89125127c3e9ec14a220bfa97a234ad1aebfa

Aliases

arxiv: math/9301208 · arxiv_version: math/9301208v1 · doi: 10.48550/arxiv.math/9301208 · pith_short_12: MYPKQTLZUPWS · pith_short_16: MYPKQTLZUPWSVE2N · pith_short_8: MYPKQTLZ

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/MYPKQTLZUPWSVE2NVUH2RSEREU \
  | 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: 661ea84d79a3ed2a934dad0fa8c89125127c3e9ec14a220bfa97a234ad1aebfa

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7ef5b5ab2cb46960e5ce44fe1dc66071dbef283a50a04f77d6a69fc1217f6b5c",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "math.LO",
    "submitted_at": "1993-01-15T00:00:00Z",
    "title_canon_sha256": "3127f565e65506675740ae20297955e073e1fe9aa201e15db14ddfa30a66c6dd"
  },
  "schema_version": "1.0",
  "source": {
    "id": "math/9301208",
    "kind": "arxiv",
    "version": 1
  }
}