You can't. In order to have a surjection between the sets S and T, the cardinality of T must be less than or equal to the cardinality of S. Otherwise you wind up having at least one point of S being defined to have more than one value in T, which means your "function" violates one of the definitions of a function: No function can have multiple values on an element of the domain.Originally Posted byThePerfectHacker

-Dan