Sea δ=4ϵ\delta=\sqrt{4}{\epsilon}δ=4ϵ. Si 0<∣x∣<4ϵ0 < |x| < \sqrt{4}{\epsilon}0<∣x∣<4ϵ, entonces ∣x4∣=x4<ϵ|x^4|=x^4 <\epsilon∣x4∣=x4<ϵ.