Fejér算子最佳逼近常数的渐近表示

Asymptotic Expression for Best Approximation Constant of Operators

给出Ｃ＿（２π）空间中算子相对于连续模（ｆ，δ＿ｎ）的最佳逼近常数的渐近表示．

Giving the asymptotic expression of quantity C_n(δ_n)=sup{F_n(f,x) f(x)||/ω(f,δ_n):f∈C_(2π),f≠const}:where F_n is operators and {δ} is any positive sequence of numbertending to z ero,asymptotic expr ession of approximation constantwere obtained