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Let $A$ be a compact set in $mathbb{R}$, and $E=A^dsubset mathbb{R}^d$. We know from the Mattila-Sjolins theorem if $dim_H(A)>frac{d+1}{2d}$, then the distance set $Delta(E)$ has non-empty interior. In this paper, we show that the threshold $frac{d+1}{2d}$ can be improved whenever $dge 5$.
Hegyvari and Hennecart showed that if $B$ is a sufficiently large brick of a Heisenberg group, then the product set $Bcdot B$ contains many cosets of the center of the group. We give a new, robust proof of this theorem that extends to all extra speci
In this paper, we prove a $Tb$ theorem on product spaces $Bbb R^ntimes Bbb R^m$, where $b(x_1,x_2)=b_1(x_1)b_2(x_2)$, $b_1$ and $b_2$ are para-accretive functions on $Bbb R^n$ and $Bbb R^m$, respectively.
Let $phi(x, y)colon mathbb{R}^dtimes mathbb{R}^dto mathbb{R}$ be a function. We say $phi$ is a Mattila--Sj{o}lin type function of index $gamma$ if $gamma$ is the smallest number satisfying the property that for any compact set $Esubset mathbb{R}^d$,
We prove a point-wise and average bound for the number of incidences between points and hyper-planes in vector spaces over finite fields. While our estimates are, in general, sharp, we observe an improvement for product sets and sets contained in a s
In this paper, we provide a non-homogeneous $T(1)$ theorem on product spaces $(X_1 times X_2, rho_1 times rho_2, mu_1 times mu_2)$ equipped with a quasimetric $rho_1 times rho_2$ and a Borel measure $mu_1 times mu_2$, which, need not be doubling but