Affine Line

<p>The line<i> l: ax + by - c = 0</i> ⇔ <i>l = (a:b:c)</i>

<i>A = [x] where x ∈ </i>Rat (Rational Numbers)

&#160;

The relative position of two points A and B is a displacement (not a distance!) and recorded by a vector.

For example:

the vector AB =&#160;(4-1) (points) = 3 if A = [1] and B = [4]</p>