1. The problem statement, all variables and given/known data See Attachment: https://www.physicsforums.com/attachment.php?attachmentid=59074&d=1369708771 2. Relevant equations As shown in the attachment, I am slightly confused as to where to begin this problem. I know that I need to prove that a function, f, is 1-1 and onto, in order for the function to be isomorphic to the cartesian product of X, but I am unaware as to where to begin this problem. Does anyone have any ideas that could help? Thank you very much, G.