Graphic presentations can always help to understand; we represent the elements of as points on an horizontal axis and the elements of on a vertical axis, as in figure 18. The elements of the cartesian products are then represented by the crossing points of the lattice of parallels to the axes through the points defined above. In Figure , we display a graphical representation for the above example.

We generalize this definition to the product of sets , , :

For a set , the cartesian power is defined in the obvious way.