ThmDex – An index of mathematical definitions, results, and conjectures.
Real square root function is strictly isotone
Formulation 0
Let $x, y \in [0, \infty)$ each be an D4767: Unsigned real number such that
(i) \begin{equation} x < y \end{equation}
Then \begin{equation} \sqrt{x} < \sqrt{y} \end{equation}
Formulation 1
Let $x, y \in [0, \infty)$ each be an D4767: Unsigned real number.
Then \begin{equation} x < y \quad \implies \quad \sqrt{x} < \sqrt{y} \end{equation}