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The endpoints p-=1 and p+=∞ for the maximal operator on Lp(·) over spaces of homogeneous type

Abstract

We investigate the boundedness of the Hardy-Littlewood maximal operator M on variable Lebesgue spaces Lp(·)(Ω,d,μ) over spaces of homogeneous type, focusing on the endpoints p-=1 and p+=∞. At the lower endpoint, we prove that the boundedness of M forces p->1 for all exponents if and only if the space (Ω,d,μ) is non-atomic. At the upper endpoint, we generalize the Muckenhoupt-Nekvinda sufficient condition of Adamadze, Diening, and Kopaliani. On bounded spaces of homogeneous type, whenever p->1, this yields a boundedness criterion based on the Muckenhoupt condition alone. We also construct an unbounded space where the Muckenhoupt condition suffices for the maximal operator's boundedness.

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BibTeX
@misc{shalukhina2026endpoints,
  title = {{The endpoints $p_-=1$ and $p_+=\infty$ for the maximal operator on $L^p(\cdot)$ over spaces of homogeneous type}},
  author = {Alina Shalukhina},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.33792},
  eprint = {2610.33792},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.33792},
}
RIS
TY  - UNPB
TI  - The endpoints p_-=1 and p_+=∞ for the maximal operator on L^p(·) over spaces of homogeneous type
AU  - Alina Shalukhina
PY  - 2026
DA  - 2026/10/24
PB  - arXiv
DO  - 10.48550/arxiv.2610.33792
UR  - https://arxiv.org/abs/2610.33792
AB  - We investigate the boundedness of the Hardy-Littlewood maximal operator M on variable Lebesgue spaces L^p(·)(Ω,d,μ) over spaces of homogeneous type, focusing on the endpoints p_-=1 and p_+=∞. At the lower endpoint, we prove that the boundedness of M forces p_->1 for all exponents if and only if the space (Ω,d,μ) is non-atomic. At the upper endpoint, we generalize the Muckenhoupt-Nekvinda sufficient condition of Adamadze, Diening, and Kopaliani. On bounded spaces of homogeneous type, whenever p_->1, this yields a boundedness criterion based on the Muckenhoupt condition alone. We also construct an unbounded space where the Muckenhoupt condition suffices for the maximal operator's boundedness.
ER  -