子集的离散族2) discrete subset 离散子集 1. A space \%X\% is said to have the property \%(wa)\% if for every open cover \%U of \%X\% and every dense subspace \%DX\%, there exists a discrete subset \%FD\% such that \%St(F, \%U \%)=X\%, where \%St(F,T]\%U \%)...
【题目】 离散数学习题画出R的关系图,并求出A中各元素的等价类=... ε, d d,c|u34.设#是正整数Z”的子集族,判断#是否构成Z 的划分(1) S_1=|x|x∈Z'_x 是数|, S_2=Z^⋅-S_1 , π=|S_1,S_2|(2) π=|:|x||x∈Z| .35.对任意非空的集合A且 P(A)-|φ| 是A的非空...