Pith Number

pith:BBSADM62

pith:2002:BBSADM62IWQMFFK2RMGD5W6OXE

not attested not anchored not stored refs pending

Satisfaction classes in nonstandard models of first-order arithmetic

Fredrik Engstr\"om

arxiv:math/0209408 v1 · 2002-09-30 · 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{BBSADM62IWQMFFK2RMGD5W6OXE}

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	2026-05-18T01:05:29.352601Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

086401b3da45a0c2955a8b0c3edbceb93d841cc08ae2b595e93d102255e7af91

Aliases

arxiv: math/0209408 · arxiv_version: math/0209408v1 · doi: 10.48550/arxiv.math/0209408 · pith_short_12: BBSADM62IWQM · pith_short_16: BBSADM62IWQMFFK2 · pith_short_8: BBSADM62

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/BBSADM62IWQMFFK2RMGD5W6OXE \
  | 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: 086401b3da45a0c2955a8b0c3edbceb93d841cc08ae2b595e93d102255e7af91

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dda2910cc490f24f3480a1324b1983ee03df2ef8bee671b9b3fe95622ead6c4d",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "math.LO",
    "submitted_at": "2002-09-30T14:44:53Z",
    "title_canon_sha256": "953e14b6d7b4788edcf27bf1ec899e5428f91d4e49780ec114d52fb36b2126b4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "math/0209408",
    "kind": "arxiv",
    "version": 1
  }
}