1. I have very good neighbours.
2. Each one in our family knows each one in our neighbours’ family.
3. That is to say, each one in our family is related to each one in our neighbours’ family.
4. The name of this relationship is, simply knowing each other!
5. Hence, our relationships form the Cartesian Product between our family and our neighbour’s family.
6. Even ZeuS tells us the rule of Cartesian Product.
7. Refer the diagram. Consider two areas on a plane namely Z and S.
8. Z has points A and B, S has points C and D. These two areas are also sets (sets of points!).
9. If we overlap Z and S, the symbol as shown in the figure is formed with A,B,C and D as edge points.
10. Look at how A is connected to C and D, B is connected to C and D and similarly C and D also connected to A and B.
11. And this symbol also has the cross (X) in it to indicate that it is Cartesian Product.
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