I still don ' t know what that sub was supposed to be <| sep |> I don ' t think her # 1 goal with the presidency was to line her own pocketsSeeing as how she takes money from the Clinton Foundation and now donations have stopped after she lost I wonder why , I don ' t think that ' s the case . <| sep |> First think about what happens B is the natural numbers . Then a function f from B to a set A is just a sequence of elements in A , that is write an fn and it looks like a sequence . And think about what AN should be . It is the countable product A times A times A times . which is exactly the same thing sequences . Now look at what happens if A is the set 2 , so A 0 , 1 . Then a function f from any set B to A is just a map from B to 0 , 1 . Writing X b in B fb 1 which has all of the information contained in f , we see that X is just a subset of B . I . e . functions from B to 2 PowerSetB 2 B . For more general sets , the same holds . Functions are maps from B to A . AB is the product of B copies of A . So just think of enumerating the set B and then each element of B gives you a copy of A when you consider all possible functions . Note without the axiom of choice , enumeration isn ' t possible .