Pith Number

pith:7UB4XINV

pith:1995:7UB4XINV43IABOWOBDCNQ3NDF6

not attested not anchored not stored refs pending

A few special ordinal ultrafilters

Claude Laflamme

arxiv:math/9501208 v1 · 1995-01-26 · 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{7UB4XINV43IABOWOBDCNQ3NDF6}

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	2026-05-18T01:05:50.671251Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fd03cba1b5e6d000bace08c4d86da32f81a031e8f8bdcebd1ccb0ec9f0079b8b

Aliases

arxiv: math/9501208 · arxiv_version: math/9501208v1 · doi: 10.48550/arxiv.math/9501208 · pith_short_12: 7UB4XINV43IA · pith_short_16: 7UB4XINV43IABOWO · pith_short_8: 7UB4XINV

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/7UB4XINV43IABOWOBDCNQ3NDF6 \
  | 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: fd03cba1b5e6d000bace08c4d86da32f81a031e8f8bdcebd1ccb0ec9f0079b8b

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "818ee77f3e72318c0bdbb97cbaf76795fe33335a1a1cfd69f071b22d184baae4",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "math.LO",
    "submitted_at": "1995-01-26T00:00:00Z",
    "title_canon_sha256": "e6e36e43cf8b39d4a19be51eb98abc26eff1ad616a7396a42412b9119b130766"
  },
  "schema_version": "1.0",
  "source": {
    "id": "math/9501208",
    "kind": "arxiv",
    "version": 1
  }
}