Prove that $\displaystyle f(x)=\frac{1}{x^2+1}$ is unif. cont. on $\displaystyle \mathbb{R}$. Any help is appreciated. The first thing I don't understand is how should I start? Given epsilon > 0. Then I gotta choose the right delta I assume. What confuses me on most of these problems it gives an interval but not on this one.