Analysis: Infimum and Supremum

[Rubik]

Homework Statement

Find the Supremum and Infimum of S where,
S = {(1/2n) : n is an integer, but not including 0}

Homework Equations

The Attempt at a Solution

Is it right if I got inf{S} = -∞ and sup{S} = ∞

 

[Bacle2]

Try checking the values you obtain when substituting n=1,2,...:

{1/2,1/4,1/6,...}

Notice that your values are positive, so that, e.g., -5 is a lower bound. Notice too,

that all the values are smaller than, e.g. 10, so that 10 is an upper bound.