ThmDex – An index of mathematical definitions, results, and conjectures.
Result R4127 on D4364: Real function
Real exponentiation function with unsigned exponent is isotone on unsigned reals
Formulation 0
Let $f : [0, \infty) \to [0, \infty)$ be a D4364: Real function such that
(i) $p \in [0, \infty)$ is an D4767: Unsigned real number
(ii) \begin{equation} f(t) = t^p \end{equation}
Let $x, y \in [0, \infty)$ each be an D4767: Unsigned real number such that
(i) \begin{equation} x \leq y \end{equation}
Then \begin{equation} f(x) \leq f(y) \end{equation}