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- W2473014313 abstract "Magyar has shown that if $B subset mathbb{Z}^d$ has positive upper density $(d geq 5)$, then the set of squared distances ${ |b_1-b_2 |^2 text{ }: text{ } b_1,b_2 in B }$ contains an infinitely long arithmetic progression, whose period depends only on the upper density of $B$. We extend this result by showing that $B$ contains locally isometrically embedded copies of every tree with edge lengths in some given arithmetic progression (whose period depends only on the upper density of $B$ and the number of vertices of the sought tree). In particular, $B$ contains all chains of elements with gaps in some given arithmetic progression (which depends on the length of the sought chain). This is a discrete analogue of a result obtained recently by Bennet, Iosevich and Taylor on chains with prescribed gaps in sets of large Haussdorf dimension. Our techniques are Ergodic theoretic and may be of independent interest to Ergodic theorists. In particular, we obtain Ergodic theoretic analogues of recent textit{optimal spherical distribution} results of Lyall and Magyar which, via Furstenberg's correspondence principle, recover their combinatorial results." @default.
- W2473014313 created "2016-07-22" @default.
- W2473014313 creator A5009489875 @default.
- W2473014313 date "2016-06-24" @default.
- W2473014313 modified "2023-09-27" @default.
- W2473014313 title "Spherical Recurrence and locally isometric embeddings of trees into positive density subsets of $mathbb{Z}^d$" @default.
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- W2473014313 hasPublicationYear "2016" @default.
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