{
  "annotation_id": "50c696a1-03ec-4af6-b97e-34a6911a4943",
  "date_created": "2026-02-17T05:53:08.714000Z",
  "date_modified": "2026-02-17T05:53:08.714000Z",
  "file_hash": "f788b621eb29cff2208c4d589616a16b4b8f9f02a3e0b34740838d4ffd01b197",
  "private": false,
  "record": {
    "abstract": "Motivated by Khintchin\u0027s 1923 conjecture, refuted by Marstrand in 1970, we study the Khintchin class of functions associated to a given increasing sequence of integers. When the Khintchin class contains L^p(\\mathbb{T}), we call the sequence a L^p-Khintchin sequence. We establish basic properties of Khintchin sequences, provide several constructions, and propose open problems for further research. We also initiate the study of Khintchin sequences of group endomorphisms on compact abelian groups. Under a Fourier-tightness assumption, we show that ergodicity (respectively, weakly mixing or strongly mixing) of a skew product of endomorphisms is equivalent to the corresponding property of the base system, supporting the idea that typical fiber orbits in such skew products should form Khintchin sequences.",
    "arxiv_id": "2601.06626",
    "authors": [
      "Aihua Fan",
      "Shilei Fan",
      "Herv\u00e9 Queff\u00e9lec",
      "Martine Queff\u00e9lec"
    ],
    "categories": [
      "math.DS"
    ],
    "license": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
    "title": "Khintchin conjecture and related topics",
    "url": "https://arxiv.org/abs/2601.06626",
    "version": "v1"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "debd2019-0141-47ef-8077-2ff680ed01d8",
    "id": "arXiv Dataset",
    "type": "Model",
    "variant": "snapshot-2026-01-17",
    "version": "0.1.0"
  },
  "user_id": 1000002
}