Ⅰ. INTRODUCTION In extremal problems of approximation theory, two important convolution classes are consistently considered, one is the Sobolev class abs. cont., which is the direct sum of R and periodic convolution ...Ⅰ. INTRODUCTION In extremal problems of approximation theory, two important convolution classes are consistently considered, one is the Sobolev class abs. cont., which is the direct sum of R and periodic convolution class with Bernoulli kernel; the other is the set of convolution class with CVD (Cyclic Variation Diminishing) kernel, one of its展开更多
文摘Ⅰ. INTRODUCTION In extremal problems of approximation theory, two important convolution classes are consistently considered, one is the Sobolev class abs. cont., which is the direct sum of R and periodic convolution class with Bernoulli kernel; the other is the set of convolution class with CVD (Cyclic Variation Diminishing) kernel, one of its
