排序方式： 共有13条查询结果，搜索用时 0 毫秒
11.
Korovkin [1] gave a necessary and sufficient condition on linear positive approximation in C[a,b]. In this note, we give such a condition on general bounded approximation in C[a, b] 相似文献
12.
In this paper, the following results are obtained. The functional estimation theorem: Let X, Y be linear spaces, normedbu ‖·‖_X, ‖·‖_Y, respectively: X be a subspace of X: Y(?)Y. Suppose that F is a functional on X×Y to [0, ∞). which has the properties : F(f_1 f_2, g) F(f_1, g) F(f_2, g), and F(f, g)相似文献
13.
