科研之友
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摘要
We give several sufficient conditions on an infinite integer matrix (d (ij) ) for the set R = {I pound (ija alpha, i %26gt; j) d (ij) : alpha aS, a%26quot;center dot, |alpha| %26lt; a} to be a density intersective set, including the cases d (nj) = j (n) (1 + O(1/n (1+epsilon) )) and . For the latter, a concentration function estimate that is of independent interest is applied to sums of sequences of 2-valued random variables whose means may grow as .
- 出版日期2012-6
