https://www.desmos.com/calculator/powhaqmvvp The animation shows that numbers on the x-axis, can be matched with numbers on the interval -1<x<1 in such a away that: 1. every x on the x-axis is matched with a different number in the interval -1<x<1, and 2. all the numbers in -1<x<1 are used hence, we can see that there must be the same number of numbers on …
jped Maths
stuff that arises in my teaching of mathematics