Suppose we have a finite number of points randomly placed on a plane. Is it always possible to rotate all the points such that every vertical line passes through at most one point?
I feel like this is true since there's only a finite number of points and an infinite number of possible rotations, but I am not quite convinced. If this is true how would we go about proving it?
If it's not true, can we add assumptions such as having no points be collinear to make this true?
Any help would be greatly appreciated.