Pith Number

pith:2MAJHLBQ

pith:2014:2MAJHLBQ5SJOAW5WIGKSOMJYKX

not attested not anchored not stored refs pending

Deep $\Pi^0_1$ Classes

Christopher P. Porter, Laurent Bienvenu

arxiv:1403.0450 v3 · 2014-03-03 · 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{2MAJHLBQ5SJOAW5WIGKSOMJYKX}

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	2026-05-18T00:51:53.345170Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

d30093ac30ec92e05bb6419527313855de7e6a6298229cce12bec4ba02edd2ee

Aliases

arxiv: 1403.0450 · arxiv_version: 1403.0450v3 · doi: 10.48550/arxiv.1403.0450 · pith_short_12: 2MAJHLBQ5SJO · pith_short_16: 2MAJHLBQ5SJOAW5W · pith_short_8: 2MAJHLBQ

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/2MAJHLBQ5SJOAW5WIGKSOMJYKX \
  | 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: d30093ac30ec92e05bb6419527313855de7e6a6298229cce12bec4ba02edd2ee

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f64cd89e72a790c3cda8f574a107db2de3ac75b1d39e791773de5c6b0ca10884",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.LO",
    "submitted_at": "2014-03-03T14:47:15Z",
    "title_canon_sha256": "4afa277f46ca0030963e942fd243a66308e4d53e7297aeadd776c785d2dd45ad"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1403.0450",
    "kind": "arxiv",
    "version": 3
  }
}