Sumset size races for measurable sets

preprint2026arXivOpen access

Abstract

Let GG be a locally compact abelian group with Haar measure μμ. For integers n≥2n \geq 2 and H≥2H \geq 2 and for any nn-tuples u1,…,uH∈Nn\mathbf{u}_1,\ldots, \mathbf{u}_H \in \mathbf{N}^n, there exist measurable subsets A1,…,AnA_1,\ldots, A_n of GG such that the nn-tuple (μ(hA1),…,μ(hAn))\left( μ(hA_1),\ldots, μ(hA_n) \right) has the same relative order as the nn-tuple uh\mathbf{u}_h for all h=1,…,Hh = 1,\ldots, H. For integers mi,hm_{i,h} for i=1,…,n−1i =1,\ldots, n-1 and h=1,…,Hh = 1,\ldots, H, there are Lebesgue measurable sets A1,…,AnA_1,\ldots, A_n in R\mathbf{R} such that μ(hAi+1)−μ(hAi)=mi,hμ(hA_{i+1}) - μ(hA_i) = m_{i,h} for all ii and hh.

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