# Thread: Question about limit points in C

1. ## Question about limit points in C

Let S be an infinite subset of $\overline{\mathbb{C}}$ (the extended complex plane). Show that either S has a limit point in S or every Disc D'( $\infty$,r) (punctured disc) contains a point of S (so that $\infty$ is a limit point of S in the space $\mathbb{C}$).

My argument so far is:
Assume S does not have a limit point in S. Then take an abitrary disc D'( $\infty$,r).
Now assume for contradiction D'( $\infty$,r) does not contain a point of S. But I can't see where I can find a contradiction to the first statement. Can someone help, or provide an alternative argument? Thanks

2. ## Re: Question about limit points in C

You have a typo in your post. "SHow that either S has a limit point in S of every Disc", the "of" should be "or".

3. ## Re: Question about limit points in C

if you don't mind please define the punctured disk D'(infinite,r).......what do wanted to mean ...please discuss explicitly......