Maths, Mathematics, Discrete Mathematics, Sets.
Note that the Cartesian product is not commutative, which means S × T != T× S. For example: S = { 1, 2 } T = { 3, 5} S × T = { (1,3), (1,5), (2, 3), (2,5) } T × S = { (3,1), (3,2), (5,1), (5,2) } Therefore: S × T ≠ T × S. This implies that two ordered pairs (s1, t1) and (s2, t2) are considered