摘要
本文研究由实系数线性微分算子所定义的2冗周期函数类并给出其半边宽度的精确估计值,和相应的极子空间。本文的结果推广了[6]。
In this paper, we study the Classmk,p,σ 0 = { f ∈ LPK+σ; || Qk,σ(D)f || P≤1,f02πQk,σ(D)f( x ) dx = 0 } whichσ is de fined by linear differential operatorWe obtain the exact value of one-sided n-widths dn+(mk0,σ,∞ ; L1) andcorresponding optimal subspace.The result has generalized [6].
关键词
周期函数
单边宽度
最优子空间
periodic function, one-sided widths, optimal subspace.
