1. The problem statement, all variables and given/known data Show that there is a bijective correspondence of AxB with BxA. 2. Relevant equations 3. The attempt at a solution I am lacking the general understanding of this. Can I create a function g such that, g: (a in A, b in B) --> (b in B, a in A). If A and B are sets, then are AxB and BxA the same?