关于Pestryakov定理的推广
On generalization of theorems of Pestryakov
摘要:
1987年,A.V. Pestryakov证明了Baire类$α$ $(α> 0)$的所有实值函数空间$B_α(X)$的基数函数的一系列定理,并证明了这些定理中的大多数对于包含$X$中零集的特征函数的所有有限线性组合的空间都成立。在本文中,我们调查的Pestriakov推广的定理是有效的。同时,我们还应用选择原理的理论证明了函数空间的一些附加命题。
英文摘要:
In 1987, A.V. Pestryakov proved a series of theorems for cardinal functions of the space $B_α(X)$ of all real-valued functions of Baire class $α$ $(α> 0)$, and he conjectured that most of these theorems are true for spaces containing all finite linear combinations of characteristic functions of zero-sets in $X$. In this paper we investigate for which theorems of Pestriakov generalizations are valid. Also we prove some additional propositions for function spaces applying the theory of selection principles.
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