Let $x_1, \dots, x_N \in [0, \infty)$ each be an D4767: Unsigned real number.

Then \begin{equation} \left( \sum_{n = 1}^N x_n \right)^{1/2} \leq \sum_{n = 1}^N x_n^{1/2} \end{equation}

Let $x_1, \dots, x_N \in [0, \infty)$ each be an D4767: Unsigned real number.

Then \begin{equation} \sqrt{ \sum_{n = 1}^N x_n } \leq \sum_{n = 1}^N \sqrt{x_n} \end{equation}