期刊文献+

由自共轭线性微分算子所确定的函数类在L_q(T)中的相对宽度

Relative Widths of Classes of Functions Defined by a Self-conjugate Linear Differential Operator in L_q(T)
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摘要 得到了使等式K_n(K_2(P_r),MK_2(P_r),L_2(T))=d_n(K_2(P_r),L_2(T))成立的最小M值,并计算了K_n(K_2(P_r),K_2(P_r),L_q(T))的渐近阶,其中K_n(.,.,L_q(T))和d_n(.,L_q(T)),1≤q≤∞,分别代表Kolmogorov意义下在L_q(T)中的相对宽度和宽度,K_2(P_r)表示定义在[-π,π]上由自共轭线性微分算子所确定的光滑函数类. The smallest number M which make the equality Kn (K2 (Pr), MK2 (Pr), L2 (T))= dn(K2(Pr), L2(T)) hold is obtained, and the asymptotic order ofKn(K2(Pr), K2(Pr), Lq(T)) is studied, where Kn(·,·, Lq(T) ) and dn(·, Lq(T) ), 1 ≤ q ≤∞, denote respectively the relative widths and widths in the sense of Kolmogorov in Lq(T), and K2(Pr) denotes the smooth function classes defined by a self-conjugate linear differential operator.
作者 肖维维
机构地区 北方工业大学
出处 《数学年刊(A辑)》 CSCD 北大核心 2008年第5期679-688,共10页 Chinese Annals of Mathematics
基金 国家自然科学基金(No.10471010) 北京市自然科学基金(No.1062004) 北京师范大学985工程资助的项目.
关键词 相对宽度 n-K宽度 自共轭线性微分算子 Relative widths, n-K widths, Self-conjugate linear differential operator
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参考文献15

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二级参考文献5

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