View source for CRN 12109: HW 2

'''Problem 6.'''
#Show that the sets $\{\frac{1}{2},\frac{1}{3},\frac{1}{4}\ldots\}$ and $\{1,\frac{1}{2},\frac{1}{3},\frac{1}{4}\ldots\}$  have the same cardinality. 
#Show that $[0,1]$ and $(0,1)$ have the same cardinality. Hint: Problem 6.1 may help.

'''Problem 7.''' Exercise 2.2.7(a)

'''Problem 8.''' Exercise 2.3.7(a)(b)

'''Problem 9.''' Using the limit definition, show that the sequence $(a_n)_{n=1}^\infty$, given by \[a_n=\sqrt{\frac{2n+5}{n+2}}\] converges to $\sqrt{2}$.

'''Problem 10.''' Let $X$ be a non-empty set that is bounded from below. Show that there is a sequence $(x_n)_{n=1}^\infty$ of elements in $X$ that converges to $\inf X$.