Pith Number

pith:VBWKNGHW

pith:2016:VBWKNGHWL2BKEGQ5UKNSNQ5GRS

not attested not anchored not stored refs pending

Undecidability of the Lambek calculus with a relevant modality

Andre Scedrov, Max Kanovich, Stepan Kuznetsov

arxiv:1601.06303 v4 · 2016-01-23 · math.LO · cs.CL

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{VBWKNGHWL2BKEGQ5UKNSNQ5GRS}

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	2026-05-18T01:09:41.858348Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a86ca698f65e82a21a1da29b26c3a68c9677d1353b26b1e0cfe98b433fa8b436

Aliases

arxiv: 1601.06303 · arxiv_version: 1601.06303v4 · doi: 10.48550/arxiv.1601.06303 · pith_short_12: VBWKNGHWL2BK · pith_short_16: VBWKNGHWL2BKEGQ5 · pith_short_8: VBWKNGHW

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/VBWKNGHWL2BKEGQ5UKNSNQ5GRS \
  | 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: a86ca698f65e82a21a1da29b26c3a68c9677d1353b26b1e0cfe98b433fa8b436

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "0be4c090311bc54e5d7d471329a8309a0dd5ecbb8c16aa3f7fee981d9db1137c",
    "cross_cats_sorted": [
      "cs.CL"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.LO",
    "submitted_at": "2016-01-23T19:48:54Z",
    "title_canon_sha256": "dad2a7451ff8f135fde059c694a5f0611fc37bbea4c359e59382d06dd55dc9ed"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1601.06303",
    "kind": "arxiv",
    "version": 4
  }
}