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arXiv 1708.02576math.FA
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紧齐性空间上的逼近工具及其应用

On approximation tools and its applications on compact homogeneous spaces

A. O. Carrijo, T. Jordão

摘要:

我们证明了Peetre型$K$ -泛函在$\mathbb{M}$,一个紧凑的两点齐性空间上的一个特征,在一个家庭的乘法算子定义为这个目的的逼近速度。这推广了球面背景下的已知结果。该刻画表明,对生成某些算子的核所施加的抽象赫尔德条件或有穷级可微性条件,意味着其特征值序列具有急剧的衰减率.最新的估计得到的Kolmogorov $n$ -宽度的单位球再生核希尔伯特空间(RKHS)。

英文摘要:

We prove a characterization for the Peetre type $K$-functional on $\mathbb{M}$, a compact two-point homogeneous space, in terms the rate of approximation of a family of multipliers operator defined to this purpose. This extends the well known results on the spherical setting. The characterization is employed to show that an abstract Hölder condition or finite order of differentiability condition imposed on kernels generating certain operators implies a sharp decay rates for their eigenvalues sequences. The latest is employed to obtain estimates for the Kolmogorov $n$-width of unit balls in Reproducing Kernel Hilbert Space (RKHS).

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