Sectorial convergence of U-statistics
Abstract
In this note we show that almost sure convergence to zero of symmetrized U-statistics indexed by a linear sector in Zd+ is equivalent to convergence along the diagonal of Zd+, as it is considered in Lata and Zinn [Ann. Probab. 28 (2000) 1908-1924]. Comparisons with similar results for sums of multi-indexed i.i.d. random variables are also made.
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