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作者:

Wang, L.-X. (Wang, L.-X..) | Peng, L.-X. (Peng, L.-X..) (学者:彭良雪)

收录:

Scopus

摘要:

Recall that a space X is a c-semistratifiable (CSS) space, if the compact sets of X are G δ-sets in a uniform way. In this note, we introduce another class of spaces, denoting it by k-c-semistratifiable (k-CSS), which generalizes the concept of c-semistratifiable. We discuss some properties of k-c-semistratifiable spaces. We prove that a T 2-space X is a k-c-semistratifiable space if and only if X has a g function which satisfies the following conditions: (1) For each x 2 X, {x} = ∩{g(x, n): n 2 ℕ} and g(x, n + 1) {square image of or equal to} g(x, n) for each n ∈ ℕ. (2) If a sequence {xn} n∈ℕ of X converges to a point x ∈ X and y n ∈ g(x n, n) for each n ∈ ℕ, then for any convergent subsequence {y nk} k∈ℕ of {y n} n∈ℕ we have that {y nk} k∈ℕ converges to x. By the above characterization, we show that if X is a submesocompact locally k-csemistratifiable space, then X is a k-c-semistratifible space, and the countable product of k-c-semistratifiable spaces is a k-c-semistratifiable space. If X = ∪{Int(X n): n ∈ ℕ} and X n is a closed k-c-semistratifiable space for each n, then X is a k-c-semistratifiable space. In the last part of this note, we show that if X = ∪{X n: n ∈ ℕ} and X n is a closed strong β-space for each n ∈ ℕ, then X is a strong β-space.

关键词:

C-semistratifiable space; G function; K-c-semistratifiable space; Strong β-space; Submesocompact space

作者机构:

  • [ 1 ] [Wang, L.-X.]College of Applied Science, Beijing University of Technology, Beijing 100124, China
  • [ 2 ] [Peng, L.-X.]College of Applied Science, Beijing University of Technology, Beijing 100124, China

通讯作者信息:

  • [Wang, L.-X.]College of Applied Science, Beijing University of Technology, Beijing 100124, China

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来源 :

Mathematica Bohemica

ISSN: 0862-7959

年份: 2011

期: 3

卷: 136

页码: 287-299

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