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Pinned geometric configurations in Euclidean space and Riemannian manifolds

Let $M$ be a compact $d$-dimensional Riemannian manifold without a boundary. Given $E \subset M$, let $Δ_ρ(E)=\{ρ(x,y): x,y \in E \}$, where $ρ$ is the Riemannian metric on $M$. Let $Δ_ρ^x$ denote the pinned distance set, namely, $\{ρ(x,y): y \in E \}$ with $x \in E$. We prove that if the Hausdorff dimension of $E$ is greater than $\frac{d+1}{2}$, then there exist many $x \in E$ such that the Lebesgue measure of $Δ^x_ρ(E)$ is positive. This result was previously established by Peres and Schlag in the Euclidean setting. The main result is deduced from a variable coefficient Euclidean formulation, which can be used to study a variety of geometric problems. We extend our result to the setting of chains studied in \cite{BIT15} and obtain a pinned estimate in this context. Moreover, we point out that our scheme is quite universal in nature and this idea will be exploited in variety of settings in the sequel.