Souslin number;
weight;
density;
complete linked systems;
N-tau(phi)-kernel of a space;
N-compact kernel of a space;
WEAK TAU-DENSITY;
D O I:
10.4995/agt.2023.17884
中图分类号:
O1 [数学];
学科分类号:
0701 ;
070101 ;
摘要:
In this paper, we study the behavior of some topological and cardinal properties of topological spaces under the influence of the N-tau(phi)-kernel of a space X. It has been proved that the N-tau(phi)-kernel of a space X preserves the density and the network ir- weight of normal spaces. Besides, shown that the N-compact kernel of a space X preserves the Souslin properties, the weight, the density, and the ir-network weight of normal spaces.