Pith Number

pith:5HC6AX3G

pith:2008:5HC6AX3GKHFLAWX4PISPTEJWQY

not attested not anchored not stored refs pending

Two universal 3-quantifier representations of recursively enumerable sets

Julia Robinson, Yuri Matiyasevich

arxiv:0802.1052 v1 · 2008-02-07 · 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{5HC6AX3GKHFLAWX4PISPTEJWQY}

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	2026-07-04T15:09:23.506561Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e9c5e05f6651cab05afc7a24f99136862a02b6217812f655ea3bec5a18d91eb2

Aliases

arxiv: 0802.1052 · arxiv_version: 0802.1052v1 · doi: 10.48550/arxiv.0802.1052 · pith_short_12: 5HC6AX3GKHFL · pith_short_16: 5HC6AX3GKHFLAWX4 · pith_short_8: 5HC6AX3G

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/5HC6AX3GKHFLAWX4PISPTEJWQY \
  | 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: e9c5e05f6651cab05afc7a24f99136862a02b6217812f655ea3bec5a18d91eb2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "b5287ec68e896636e2f3f5ec26d3aadefce7ae216c10da0dcab4edcf166a0058",
    "cross_cats_sorted": [],
    "license": "",
    "primary_cat": "math.LO",
    "submitted_at": "2008-02-07T20:07:21Z",
    "title_canon_sha256": "d4f2ef7a571588fdcd03573b9595b9108533bb83209d20cfa75ef483f8200bfc"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0802.1052",
    "kind": "arxiv",
    "version": 1
  }
}