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Strong Partially Greedy Bases and Lebesgue-Type Inequalities
Constructive Approximation ( IF 2.7 ) Pub Date : 2021-04-08 , DOI: 10.1007/s00365-021-09531-8
M. Berasategui , P. M. Berná , S. Lassalle

In this paper, we continue the study of Lebesgue-type inequalities for greedy algorithms. We introduce the notion of strong partially greedy Markushevich bases and study the Lebesgue-type parameters associated with them. We prove that this property is equivalent to that of being conservative and quasi-greedy, extending a similar result given in Dilworth et al. (Constr Approx 19:575–597, 2003) for Schauder bases. We also give a characterization of 1-strong partial greediness, following the study started in Albiac and Ansorena (Rev Matem Compl 30(1):13–24, 2017), Albiac and Wojtaszczyk (J Approx Theory 138:65–86, 2006).



中文翻译:

强烈的部分贪婪基础和Lebesgue型不等式

在本文中,我们继续研究贪婪算法的Lebesgue型不等式。我们介绍了强局部贪婪的Markushevich基的概念,并研究了与它们相关的Lebesgue型参数。我们证明了该性质等同于保守和准贪婪的性质,扩展了Dilworth等人给出的类似结果。(Constr约19:575–597,2003年)适用于Schauder基地。在Albiac和Ansorena(Rev Matem Compl 30(1):13-24,2017),Albiac和Wojtaszczyk(J Approx Theory 138:65-86,2006)开始研究之后,我们还给出了1个强烈的部分贪婪的特征。 )。

更新日期:2021-04-08
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