Pith Number

pith:DYY2HWIV

pith:2008:DYY2HWIVFDHUNOLOT34A4XHYUT

not attested not anchored not stored refs pending

Exhaustible sets in higher-type computation

Martin Escardo

arxiv:0808.0441 v2 · 2008-08-04 · cs.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{DYY2HWIVFDHUNOLOT34A4XHYUT}

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	2026-05-18T01:37:42.362735Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1e31a3d91528cf46b96e9ef80e5cf8a4e67631a186fd0093738fb968896e5b70

Aliases

arxiv: 0808.0441 · arxiv_version: 0808.0441v2 · doi: 10.48550/arxiv.0808.0441 · pith_short_12: DYY2HWIVFDHU · pith_short_16: DYY2HWIVFDHUNOLO · pith_short_8: DYY2HWIV

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/DYY2HWIVFDHUNOLOT34A4XHYUT \
  | 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: 1e31a3d91528cf46b96e9ef80e5cf8a4e67631a186fd0093738fb968896e5b70

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8cabd89fc898567e2404eecbe150ca9b1a8fd723c5509cb2a8c0e36faa4d32d8",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2008-08-04T13:41:09Z",
    "title_canon_sha256": "a3b8eb0118c874941e33fc669f38619442cac51e6eb364c304c07db0168e3e53"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0808.0441",
    "kind": "arxiv",
    "version": 2
  }
}