论文标题
Lindelöf，H封闭和CCC的常见扩展
A common extension of Lindelöf, H-closed and ccc
论文作者
论文摘要
不平等$ | x | \ \ leq 2^{χ（x）} $对于Lindelöf空间（Arhangel'ski \uı，1969），$ H $ claped的空间（Dow-Porter，1982）和CCC Space（Hajnal-Juás666167）被证明是正确的。我们提供了所有这些属性的共同扩展，使我们能够为这三个定理提供统一的证明。
The inequality $|X| \leq 2^{χ(X)}$ has been proved to be true for Lindelöf spaces (Arhangel'ski\uı, 1969), $H$-closed spaces (Dow-Porter, 1982) and ccc spaces (Hajnal-Juász 1967), by quite different arguments. We present a common extension of all these properties which allows us to give a unified proof of these three theorems.
