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Weakly porous sets and $A_1$ Muckenhoupt weights in spaces of homogeneous type
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abstract
In this work we characterize the sets $E\subset X$ for which there is some $\alpha>0$ such that the function $d(\cdot,E)^{-\alpha}$ belongs to the Muckenhoupt class $A_1(X,d,\mu)$, where $(X,d,\mu)$ 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 Mac\'ias and Carlos Segovia in "A well-behaved quasi-distance for spaces of homogeneous type", Trabajos de Matem\'atica 32, Instituto Argentino de Matem\'atica, 1981, 1-18.
Forward citations
Cited by 2 Pith papers
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One-sided Muckenhoupt weights and one-sided weakly porous sets in $\mathbb{R}$
A set E is right-sided weakly porous if and only if d(.,E)^(-α) belongs to the one-sided Muckenhoupt class A1+ for some α>0 and is locally integrable.
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Weak porosity in spaces of homogeneous type
In spaces of homogeneous type with open balls, weak porosity plus a doubling free-hole function implies dist(·,E)^{-α} is A1, and A1 conversely forces the free-hole function to be doubling.
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