Pith Number

pith:QKHJELOR

pith:2019:QKHJELORKOHRLFL2TWNKERG3AN

not attested not anchored not stored refs pending

Monadic Second-Order Logic with Path-Measure Quantifier is Undecidable

Aniello Murano, Bastien Maubert, Emmanuel Filiot, Jean-Fran\c{c}ois Raskin, Laureline Pinault, Rapha\"el Berthon, Sasha Rubin, Shibashis Guha

arxiv:1901.04349 v5 · 2019-01-14 · 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{QKHJELORKOHRLFL2TWNKERG3AN}

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	2026-05-17T23:53:49.590177Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

828e922dd1538f15957a9d9aa244db037605f2e13fd6b2c0de6f5a63471f9e3f

Aliases

arxiv: 1901.04349 · arxiv_version: 1901.04349v5 · doi: 10.48550/arxiv.1901.04349 · pith_short_12: QKHJELORKOHR · pith_short_16: QKHJELORKOHRLFL2 · pith_short_8: QKHJELOR

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/QKHJELORKOHRLFL2TWNKERG3AN \
  | 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: 828e922dd1538f15957a9d9aa244db037605f2e13fd6b2c0de6f5a63471f9e3f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "70c16704a650fff15f415e55dc46f488b9da7a05753e6d6392d5546d4576888a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LO",
    "submitted_at": "2019-01-14T14:41:41Z",
    "title_canon_sha256": "6767976280b848e521ccbc546e563e8871d5ba70e2219f63b155f8b5dbd4d7b6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1901.04349",
    "kind": "arxiv",
    "version": 5
  }
}