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arXiv 2006.03290math.CV
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再生核希尔伯特空间中n-最佳核逼近的一个充分条件

A sufficient condition for n-Best Kernel Approximation in Reproducing Kernel Hilbert Spaces

Wei Qu, Tao Qian, Guan-Tie Deng

摘要:

证明了如果由定义在${\bf E},$上的函数组成的再生核Hilbert空间$H_K,$具有双边界消失条件(DBVC)和线性无关条件(LIC),则对于任意预设自然数$n,$和任意函数$f\in H_K,$,存在一组$n$参数化多核${\tilde{K}}_{w_1},\cdots,{\tilde{K}}_{w_n}, w_k\in {\bf E}, k=1,\cdots,n,$和实数(或复)常数$c_1,\cdots,c_n,$引起最优化问题的解\[ \|f-\sum_{k=1}^n c_k{\tilde{K}}_{w_k}\|=\inf \{\|f-\sum_{k=1}^n d_k{\tilde{K}}_{v_k}\|\ |\ v_k\in {\bf E}, d_k\in {\bf R}\ ({\rm or}\ {\bf C}), k=1,\cdots,n\}.\]通过应用本文的定理,我们证明了Hardy空间和Bergman空间,以及单位圆盘上的所有加权Bergman空间都具有$n$ -最佳逼近.在Hardy空间的情形下,这给出了一个经典结果的新证明。在此基础上,进一步证明了实球面上有限能量函数的$n$ -最佳球面Poisson核逼近的存在性.

英文摘要:

We show that if a reproducing kernel Hilbert space $H_K,$ consisting of functions defined on ${\bf E},$ enjoys Double Boundary Vanishing Condition (DBVC) and Linear Independent Condition (LIC), then for any preset natural number $n,$ and any function $f\in H_K,$ there exists a set of $n$ parameterized multiple kernels ${\tilde{K}}_{w_1},\cdots,{\tilde{K}}_{w_n}, w_k\in {\bf E}, k=1,\cdots,n,$ and real (or complex) constants $c_1,\cdots,c_n,$ giving rise to a solution of the optimization problem \[ \|f-\sum_{k=1}^n c_k{\tilde{K}}_{w_k}\|=\inf \{\|f-\sum_{k=1}^n d_k{\tilde{K}}_{v_k}\|\ |\ v_k\in {\bf E}, d_k\in {\bf R}\ ({\rm or}\ {\bf C}), k=1,\cdots,n\}.\] By applying the theorem of this paper we show that the Hardy space and the Bergman space, as well as all the weighted Bergman spaces in the unit disc all possess $n$-best approximations. In the Hardy space case this gives a new proof of a classical result. Based on the obtained results we further prove existence of $n$-best spherical Poisson kernel approximation to functions of finite energy on the real-spheres.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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