Weakly porous sets and $A_1$ Muckenhoupt weights in spaces of homogeneous type
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| Format: | Preprint |
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2024
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| _version_ | 1866914842449805312 |
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| author | Aimar, Hugo Gómez, Ivana Vargas, Ignacio Gómez |
| author_facet | Aimar, Hugo Gómez, Ivana Vargas, Ignacio Gómez |
| contents | In this work we characterize the sets $E\subset X$ for which there is some $α>0$ such that the function $d(\cdot,E)^{-α}$ belongs to the Muckenhoupt class $A_1(X,d,μ)$, where $(X,d,μ)$ is a space of homogeneous type, extending a recent result obtained by Carlos Mudarra in metric spaces endowed with doubling measures. In particular, generalizations of the notions of weakly porous sets and doubling of the maximal hole function are given and it is shown that these concepts have a natural connection with the $A_1$ condition of some negative power of its distance function. The proof presented here is based on Whitney-type covering lemmas built on balls of a particular quasi-distance equivalent to the initial quasi-distance $d$ and provided by Roberto Macías and Carlos Segovia in "A well-behaved quasi-distance for spaces of homogeneous type", Trabajos de Matemática 32, Instituto Argentino de Matemática, 1981, 1-18. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2406_14369 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Weakly porous sets and $A_1$ Muckenhoupt weights in spaces of homogeneous type Aimar, Hugo Gómez, Ivana Vargas, Ignacio Gómez Classical Analysis and ODEs Metric Geometry 28A80, 28A75, 42B37 In this work we characterize the sets $E\subset X$ for which there is some $α>0$ such that the function $d(\cdot,E)^{-α}$ belongs to the Muckenhoupt class $A_1(X,d,μ)$, where $(X,d,μ)$ is a space of homogeneous type, extending a recent result obtained by Carlos Mudarra in metric spaces endowed with doubling measures. In particular, generalizations of the notions of weakly porous sets and doubling of the maximal hole function are given and it is shown that these concepts have a natural connection with the $A_1$ condition of some negative power of its distance function. The proof presented here is based on Whitney-type covering lemmas built on balls of a particular quasi-distance equivalent to the initial quasi-distance $d$ and provided by Roberto Macías and Carlos Segovia in "A well-behaved quasi-distance for spaces of homogeneous type", Trabajos de Matemática 32, Instituto Argentino de Matemática, 1981, 1-18. |
| title | Weakly porous sets and $A_1$ Muckenhoupt weights in spaces of homogeneous type |
| topic | Classical Analysis and ODEs Metric Geometry 28A80, 28A75, 42B37 |
| url | https://arxiv.org/abs/2406.14369 |