Tchebycheff-Fourier级数的(G,μ)平均逼近

Approximation by ( G,μ) Means of Tchebycheff Fourier Series

定义了（Ｇ，μ）平均算子；讨论了ｆ∈Ｃｒ［－１，１］的Ｔ－Ｆ级数的（Ｇ，μ）平均的逼近阶；改进并推广了刘瑞珍所得到的相应结果．

The (G,μ) means are defined,and the degree of approximation to functions f∈C r by ( G,μ) means of T F series is discussed.The result given by Liu R is generalized and improved.