Pith Number

pith:QDLN3BUA

pith:2026:QDLN3BUA6ZTA4TVUDSJQFICQQX

not attested not anchored not stored refs pending

LLMs versus the Halting Problem: Characterizing Program Termination Reasoning

Dafna Shahaf, Jordi Armengol-Estape, Julien Vanegue, Oren Sultan, Pascal Kesseli, Peter O'Hearn, Yossi Adi

arxiv:2601.18987 v5 · 2026-01-26 · cs.CL · cs.AI · cs.PL

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

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{QDLN3BUA6ZTA4TVUDSJQFICQQX}

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.

Cited by

3 papers in Pith

Why Code, Why Now: An Information-Theoretic Perspective on the Limits of Machine Learning

Natural Language based Specification and Verification

Teaching LLMs Program Semantics via Symbolic Execution Traces

Receipt and verification

First computed	2026-05-27T01:05:43.136118Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

80d6dd8680f6660e4eb41c9302a05085e88fa9e3d24ab9611fc6d22326099da7

Aliases

arxiv: 2601.18987 · arxiv_version: 2601.18987v5 · doi: 10.48550/arxiv.2601.18987 · pith_short_12: QDLN3BUA6ZTA · pith_short_16: QDLN3BUA6ZTA4TVU · pith_short_8: QDLN3BUA

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/QDLN3BUA6ZTA4TVUDSJQFICQQX \
  | 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: 80d6dd8680f6660e4eb41c9302a05085e88fa9e3d24ab9611fc6d22326099da7

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "01054f4e1f575571a1ffce4ca010d52aba9bb4a3892213a372b0a27848c51a76",
    "cross_cats_sorted": [
      "cs.AI",
      "cs.PL"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CL",
    "submitted_at": "2026-01-26T21:44:12Z",
    "title_canon_sha256": "11cf2713868171174f298e403c8e0acf2c7b92b99f1a7dc66369b7202b5c3ac2"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2601.18987",
    "kind": "arxiv",
    "version": 5
  }
}