countable covering

It contains the point countable covers, the classified hypothesis of spaces, hereditarily closure preserving covers, independence, the topology of function spaces and some open problems.

綜述作者近年來在廣義度量空間理論中的研究進展 ,內容涉及點可數覆蓋、空間分類設想、遺傳閉包保持覆蓋、獨立性問題與函數空間拓撲 ,同時提出一些尚未解決的問

In this paper the newest advances about point-countable covers have been given at home and abroad since 1994.

綜述了１９９４年以來國際上關于點可數覆蓋研究的最新進展，涉及度量空間的確定ｓ映象、度量空間的確定緊映象和具有點可數ｋ網的空間等，列舉一些尚未解決的問題供探討。

In this paper,we discuss when f(x) is a real valued function on E(ER 1),the sets of various discontinuous points of f(x) is or not is countable;when f(x) is semi continuous function,discontinuous points of f(x) is or not is countable.

給出當 f(x)是 E(E R1)上的實值有界半連續函數時 ,f(x)的不連續點是至多可數的 ,從而當 f(x)為強半連續函數時 ,則 f(x)取至多可數值。

English nouns can be practically classified into countable nouns and uncountable nouns.

英語名詞可以從實用的角度分為可數名詞及不可數名詞。

In this paper, the concepts of twelve countable compactness in symmetric topological molecular lattices are introduced.

在對稱拓撲分子格中引入12種可數緊性的概念,著重指出了它們在極不連通的對稱拓撲分子格中的內在聯系。