Open set

A set is open if every point in is an interior point. A set is closed if it contains all of its b...

More generally, one defines open sets as the members of a given collection of subsets of a given ...

. In one-space, the open set is an open interval. In two-space, the open set is a disk. In three-...

點集拓樸. 範例-Rn空間. 歷史切片. 賦距空間 (metric spaces). 距離函數. closed set. open set. 緊緻集 (compact set). open co...