Welcome to our community

Be a part of something great, join today!

open/closed (3)

dwsmith

Well-known member
Feb 1, 2012
1,673
All numbers of the form $(-1)^n/[1 + (1/n)]$, $n\in\mathbb{Z}^+$.

$(-1)^n/[1 + (1/n)] = (-1, 1)$ is that true?
 

CaptainBlack

Well-known member
Jan 26, 2012
890
All numbers of the form $(-1)^n/[1 + (1/n)]$, $n\in\mathbb{Z}^+$.

$(-1)^n/[1 + (1/n)] = (-1, 1)$ is that true?
For what $n\in\mathbb{Z}^+$ does $-2/3=(-1)^n/[1 + (1/n)]$

CB
 

dwsmith

Well-known member
Feb 1, 2012
1,673
So the accumulation points are 1 and -1 and the set is open then.