Proving $f_n(x)=x^2/n$ does NOT converge uniformly to 0 for $n\rightarrow\infty$ and $x\in\mathbb{R}$
Show that $f_n(x) = \frac{x^2}{n}$ for $x \in \mathbb{R}$ does not converge uniformly towards $0$ for $n \rightarrow \infty$