Pith Number

pith:WB33CR2D

pith:2015:WB33CR2DUG46DCUM6NXIFS5XZ2

not attested not anchored not stored refs pending

Undecidability of a Very Simple Modal Logic with Binding

Guillaume Hoffmann

arxiv:1508.03630 v1 · 2015-08-14 · 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{WB33CR2DUG46DCUM6NXIFS5XZ2}

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	2026-05-18T01:35:15.557647Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b077b14743a1b9e18a8cf36e82cbb7ceaff2c8462982ac60fbedc82d9825f369

Aliases

arxiv: 1508.03630 · arxiv_version: 1508.03630v1 · doi: 10.48550/arxiv.1508.03630 · pith_short_12: WB33CR2DUG46 · pith_short_16: WB33CR2DUG46DCUM · pith_short_8: WB33CR2D

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/WB33CR2DUG46DCUM6NXIFS5XZ2 \
  | 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: b077b14743a1b9e18a8cf36e82cbb7ceaff2c8462982ac60fbedc82d9825f369

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6b0702abbe74de5d23e2378f80372dc57fff4e9b08a4e591b1d51b47a99d0637",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2015-08-14T20:00:51Z",
    "title_canon_sha256": "00efc37ab329bb7450dd9c19e6043c9f1ab7d3f0b8e04ea4524931b3515397e4"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1508.03630",
    "kind": "arxiv",
    "version": 1
  }
}