IB Maths Resources from Intermathematics | 300 IB Maths Exploration ideas, video tutorials and Exploration Guides | Page 3
Is the assertion [math] \forall r, s \in \mathbb{R}, r^s \in \mathbb{R} [/math] true? If so, is it trivial, or does it need proving? If the latter, then what is the proof? -