Need help on some problems w/ accumulation points

[philbein]

Homework Statement

Give an example of a set with exactly two accumulation points.

Homework Equations

We can use the definition of accumulation points

The Attempt at a Solution

I really have no idea where to get started on this. If I could get a hint that would be great thank you

 

[HallsofIvy]

Well, you listed the "definition of accumulation points" as a "relevant equation"! What is that definition.

Suppose you had a sequence such as {1, 1/2, 1/3, ..., 1/n, ...}. That is a set of real numbers. What are its accumulation points?