$$\mathcal{A}=\left\{\left(\sqrt[n]{n}, \frac{2n+1}{n}\right ]\mid n\in \mathbb{N} \right\}\subset \mathcal{P}(\mathbb{R})$$
$$\Rightarrow$$
$$\mathcal{B}=\left\{\cap \mathcal{A}^* \mid \mathcal{A}^*\subset \mathcal{A}, \,\ \mid \mathcal{A}^*\mid <\mathcal{N}_0 \right\}$$
$$\Rightarrow$$
$$\tau =\left\{\cup \mathcal{B}^* \mid \mathcal{B}^*\subset \mathcal{B} \right\}$$
ailesi aradığın topoloji olacaktır.