两个独立空间拥有公共基的一些先决条件

Some Preconditions for a Common Base of Two Independence Spaces

对于两个独立空间如何拥有一个公共独立集,给出了一些先决条件.进一步地,对于两个独立空间何时拥有一个公共基的一些情况,也给出了一些先决条件.最后,对于Welsh于1976年提出的公开问题给予了部分回答.

Some preconditions were provided for two independent spaces to have a common independent set. Further more,it had a common base for some cases. Finally,an open problem of Welsh posted in1976 was partially answered.