Pith Number

pith:AKWZAB72

pith:2026:AKWZAB72Z7DREU2QT3IQ5E3XZC

not attested not anchored not stored refs pending

Extensionalism without Logicism: Ambrose and Extensional Logic

Juan J. Colomina-Alminana

arxiv:2605.20225 v1 · 2026-05-14 · math.HO · math.LO · math.NT

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{AKWZAB72Z7DREU2QT3IQ5E3XZC}

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	2026-05-21T00:04:21.747278Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

02ad9007facfc71253509ed10e9377c8aeed7e4afc556c1d6418328dca217ec8

Aliases

arxiv: 2605.20225 · arxiv_version: 2605.20225v1 · doi: 10.48550/arxiv.2605.20225 · pith_short_12: AKWZAB72Z7DR · pith_short_16: AKWZAB72Z7DREU2Q · pith_short_8: AKWZAB72

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/AKWZAB72Z7DREU2QT3IQ5E3XZC \
  | 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: 02ad9007facfc71253509ed10e9377c8aeed7e4afc556c1d6418328dca217ec8

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "485a051f6d0e9466329bd8a889692fb69fa95fcb15b03ca96ace3a6bc23d1cf8",
    "cross_cats_sorted": [
      "math.LO",
      "math.NT"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "math.HO",
    "submitted_at": "2026-05-14T17:06:00Z",
    "title_canon_sha256": "e2c4f0d53929d98c78b25fbf4ac91123801ab33bb71b6bb2319b141cda235041"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.20225",
    "kind": "arxiv",
    "version": 1
  }
}