Ruzsa’s problem on sets of recurrence
Ruzsa’s problem on sets of recurrence
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Ruzsa 的递归集问题
DOI:
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发表时间:
1987
期刊:
影响因子:
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通讯作者:
J. Bourgain
中科院分区:
文献类型:
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作者:
J. Bourgain
AbstractThe main purpose of this paper is to prove the existence of Poincaré sequences of integers which are not van der Corput sets. This problem was considered in I. Ruzsa’s expository article [R1] (1982–83) on correlative and intersective sets. Thus the existence is shown of a positive non-continuous measureμ on the circle which Fourier transform vanishes on a set of recurrence, i.e.S={n ∈Z;
$$hat mu $$
(n)=0} is a set of recurrence but not a van der Corput set. The method is constructive and involves some combinatorial considerations. In fact, we prove that the generic density condition for both properties are the same.