Modern Geometry Proof
Show that every line has an innite number of points.
Hint: Start with A1 and A2 distinct points on the line. How do you get these two points?
Next describe how, once you have produced points up to An, you can find a new point An+1.
In order to guarantee that An+1 is not equal to any previous points, you will need to produce
An+1 carefully. For example, can you find an An+1 so that it is not in A1 * An * An+1? Can
you prove (by induction on n) that every Ai with i < n + 1 is in A1An+1, but not equal to
An+1. Finally, can you use this result to show that Ai != Aj if i != j?
Can someone show this? I havn't a clue on this one... Thanks.
Hm, when working with the line, am I allowed to add points to obtain another point? Or am I to consider the line as a purely geometrical object without any operations?