Please help with this problem..... {an} = { (-1)^n } { n^2 } Show this is a null sequence. Can anybody help.?.?.?
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Originally Posted by Craige Please help with this problem..... {an} = { (-1)^n } { n^2 } Show this is a null sequence. Can anybody help.?.?.? Let $\displaystyle \epsilon > 0$ and choose $\displaystyle N=\frac{1}{\sqrt{\epsilon}}$. Then if $\displaystyle n>N$ it will follow that $\displaystyle |a_n|<\epsilon$.
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