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Estimates for n-widths of sets of smooth functions on complex spheres

机译:复杂球体上平滑功能集N宽的估计

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In this work we investigate n-widths of multiplier operators Lambda* and Lambda, defined for functions on the complex sphere Omega(d) of C-d, associated with sequences of multipliers of the type {lambda(*)(m,n)}(m,n is an element of N), lambda(*)(m,n) = lambda(m + n) and {lambda(m,n)}(m,n is an element of N), lambda(m, n) = lambda(max{m, n}), respectively, for a bounded function. defined on [0, infinity). If the operators Lambda(*) and Lambda are bounded from L-p(Omega(d)) into L-q(Omega(d)), 1 = p, q = infinity, and U-p is the closed unit ball of L-p(Omega(d)), we study lower and upper estimates for the n-widths of Kolmogorov, linear, of Gelfand and of Bernstein, of the sets Lambda(*) U-p and Lambda U-p in L-q(Omega(d)). As application we obtain, in particular, estimates for the Kolmogorov n-width of classes of Sobolev, of finitely differentiable, infinitely differentiable and analytic functions on the complex sphere, in L-q(Omega(d)), which are order sharp in various important situations. (C) 2020 Elsevier Inc. All rights reserved.
机译:在这项工作中,我们调查乘法器运营商Lambda *和Lambda的N宽,定义为CD的复杂球体Omega(d)上的功能,与{lambda(*)(m,n)}的乘数序列相关联( m,n是n)的元素,λ(*)(m,n)= lambda(m + n)和{lambda(m,n)}(m,n是n的元素),lambda(m, n)=限定函数的Lambda(Max {M,N})。在[0,无穷大)上定义。如果操作员Lambda(*)和λ从LP(OMEGA(D))界定为LQ(OMEGA(D)),则1& = p,q& infinity,并且Up是LP的闭合单元球(欧米茄(d)),我们研究了柯尔莫哥洛夫的正宽度下限和上限估算,线性的盖尔芬德和伯恩斯坦套拉姆达(*)升和(LAMBDA Up在LQ欧米茄(d))的。作为所应用的应用,特别是在LQ(Omega(D))中,在复杂的球体上有限于SoboLev类的Kolmogorov N宽的估计,其在LQ(OMEGA(D))中,这是各种重要的尖锐情况。 (c)2020 Elsevier Inc.保留所有权利。

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