The Density ofBh[g] Sequences and the Minimum of Dense Cosine Sums
The Density ofBh[g] Sequences and the Minimum of Dense Cosine Sums
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Bh[g]序列的密度与稠余弦和的最小值
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发表时间:
1996
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通讯作者:
M. N. Kolountzakis
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作者:
M. N. Kolountzakis
A setEof integers is called aBh[g] set if every integer can be written in at mostgdifferent ways as a sum ofhelements ofE. We give an upper bound for the size of aBh[1] subset {n1, …,nk} of {1, …,n} wheneverh=2mis an even integer:[formula]For the caseh=2 (h=4) this has already been proved by Erdos and Turan (by Lindstrom). It has been independently proved for all evenhby Jia [9] who used an elementary combinatorial argument. Our method uses a result, which we prove, related to the minimum of dense cosine sums which roughly states that if 1⩽λ1<…<λN⩽(2−e) NareNdifferent integers then[formula]Finally we exhibit some dense finite and infiniteB2[2] sequences.