Exercise 41 Page 220

We can think of the first set A as the x-coordinates and the second set B as the y-coordinates. The cross product of two sets A and B is written as A* B, where all elements in A are paired with each element in B in ordered pair form (a,b).

A&={ π , 2π, 3π, 4π} B&={2, 4} A* B &={ ( π,2), ( π,4), & ( 2π,2), ( 2π,4), & ( 3π,2), ( 3π,4), & ( 4π,2), ( 4π,4)}