Pith Number

pith:UCWD2FHR

pith:2015:UCWD2FHRPRVQWKHIE5M66NRHG3

not attested not anchored not stored refs pending

On the construction of fully interpreted formal languages which posses their truth predicates

Seppo Heikkil\"a

arxiv:1511.02782 v2 · 2015-11-09 · 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{UCWD2FHRPRVQWKHIE5M66NRHG3}

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	2026-05-18T01:20:18.870077Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a0ac3d14f17c6b0b28e82759ef362736c65070b7cc30bdb57672a21c69e17d23

Aliases

arxiv: 1511.02782 · arxiv_version: 1511.02782v2 · doi: 10.48550/arxiv.1511.02782 · pith_short_12: UCWD2FHRPRVQ · pith_short_16: UCWD2FHRPRVQWKHI · pith_short_8: UCWD2FHR

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/UCWD2FHRPRVQWKHIE5M66NRHG3 \
  | 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: a0ac3d14f17c6b0b28e82759ef362736c65070b7cc30bdb57672a21c69e17d23

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1c7f3d78c528421cff3b1a8595df6932bb4ad8383044c8d2d31ce6900c820b0c",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.LO",
    "submitted_at": "2015-11-09T17:47:04Z",
    "title_canon_sha256": "a71d6499e5cc6835a7ab61f93b65da3a6c0a0a03467151c71a7819c547ddbccf"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1511.02782",
    "kind": "arxiv",
    "version": 2
  }
}