集合、函数与数列都是数学中的最基本、最重要的概念 .这些概念产生的性质与理论渗透到数学各类分支中 ,对于提高数学素养是大有益处的 .从深层次考虑集合、函数与数列这三个问题 ,它们既有区别 ,又有联系 ,解答此类问题时要注意在不同条件下的合理运用各类知识 ,并要注意各类 Collections, functions and sequences are the most basic and important concepts in mathematics. The nature and theories of these concepts are permeated into various branches of mathematics, and it is of great benefit to improve mathematics literacy. Considering sets and functions from a deep level With these three questions of the series, they are both distinct and related. When answering such questions, it is necessary to pay attention to the rational use of various types of knowledge under different conditions, and to pay attention to various types of knowledge.