目的得到有关θ-开集及δ-开集的一些新结果。方法以θ-开集及δ-开集的定义为基础,用拓扑和范畴论方法进行研究。结果得到θ-开集及δ-开集的判据、联系以及相关的映射和范畴的一些性质。结论类似于拓扑空间中的开集,θ-开集和δ-开集也是重要和有用的。
Aim To obtain some new results on θ-open sets and δ-open sets. Methods Based on the definitions of θ-open sets and δ-open sets, topological and categorical metheods were used. Results Characterations of θ-open sets and δ-open sets and connections between them, and properties of related mappings and categories are obtained. Conclusion Analogous to open sets in topological spaces,θ-open sets and δ-open sets are important and useful.