Show that the sets [2,4] u [6,10] and (-2,2) have the same cardinality.(using the Schroeder-Berstein Theorem) so I have to define f: [2,4] u [6,10] --> (-2,2) by f(x)= any f(x) I get that works... when you inverse it so that I define f: (-2,2) --> [2,4] u [6,10] by g(x)= I can't get to work... can anyone help me?