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VARIATIONS ON THE SUM-PRODUCT PROBLEMS II

机译:和乘积问题的变化II

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This paper is a sequel to a paper entitled Variations on the sum-product problem by the same authors [SIAM J. Discrete Math., 29 (2015), pp. 514-540]. In this sequel, we quantitatively improve several of the main results of the first paper as well as generalize a method from it to give a near-optimal bound for a new expander. The main new results are the following bounds, which hold for any finite set A subset of R : there exists a is an element of A such that vertical bar A (A + a) vertical bar greater than or similar to vertical bar A vertical bar(3/2+1/186) vertical bar A vertical bar(3/2+1/34), vertical bar A(A+A) greater than or similar to vertical bar A vertical bar(3/2+5/242). vertical bar{(a(1) + a(2) + a(3) + a(4))(2) + log a(5) ; a(i) is an element of A}vertical bar vertical bar A vertical bar(2)/log vertical bar A vertical bar,s
机译:该论文是同一作者题为“求和积问题的变化”的论文的续篇[SIAM J. Discrete Math。,29(2015),pp。514-540]。在这个续集中,我们从数量上改进了第一篇论文的一些主要结果,并从中概括了一种方法,可以为新扩展器提供接近最佳的边界。主要的新结果是以下范围,适用于R的任何有限集A的子集:存在a的元素A使得竖线A(A + a)竖线大于或类似于竖线A竖线(3/2 + 1/186)垂直条A垂直条(3/2 + 1/34),垂直条A(A + A)大于或类似于垂直条A垂直条(3/2 + 5/242) )。竖线{(a(1)+ a(2)+ a(3)+ a(4))(2)+ log a(5); a(i)是A}的元素竖线竖线竖线(2)/对数竖线竖线,s

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