(x, y) are the components of a vector expressed in a 2D space, where space as the medium the vector is in. The dimension of the vector and the dimension of the

(x, y) are the components of a vector expressed in a 2D space, where space as the medium the vector is in. The dimension of the vector and the dimension of the space it's in are different. You can have a 0-dimension point on the 2D space, a 1-dimension line on the 2D space, and a 2-dimension plane on the 2D space.