研究了一类自相似集ERn,它具有最好几乎处处最好覆盖,而集合{r∈(0,1)∶■x∈E,■sC(E,x)=r}和集合{x∈E∶■sC(E,x)〈1}的基数分别是1和可数基数(即自然数集合的基数),从而在一定条件下初步回答了Zuoling Zhou和Feng Li提出的一个公开问题.
In this paper,we discuss a class of self-similar sets ERn,which hav e best Hs-a.e.Coverings,and the propertes Card={r∈(0,1)∶■x∈E,■sC(E,x)=r}=1 and Card {x∈E∶■sC(E,x)1}=a.As a consequence,we give an answer to the open pr oblem posed by Zuoling Zhou and Feng Li in an elementary way.