Multi-parameter projection theorems with applications to sums-products and finite point configurations in the Euclidean setting

Details Multi-parameter projection theorems with applications to sums-products and finite point configurations in the Euclidean setting Multi-parameter projection theorems with applications to sums-products and finite point configurations in the Euclidean setting

2011-06-28

arxiv.org/abs/1106.5544v1

Mathematics

Classical Analysis and ODEs

Scientific paper

In this paper we study multi-parameter projection theorems for fractal sets. With the help of these estimates, we recover results about the size of $A \cdot A+...+A \cdot A$, where $A$ is a subset of the real line of a given Hausdorff dimension, $A+A=\{a+a': a,a' \in A \}$ and $A \cdot A=\{a \cdot a': a,a' \in A\}$. We also use projection results and inductive arguments to show that if a Hausdorff dimension of a subset of ${\Bbb R}^d$ is sufficiently large, then the ${k+1 \choose 2}$-dimensional Lebesgue measure of the set of $k$-simplexes determined by this set is positive. The sharpness of these results and connection with number theoretic estimates is also discussed.

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