I'm working on two-column proofs and I understand how to do it, but it is hard having to remember all the theorems, postulates, etc. and apply them to the future proofs. I am stuck on this one problem and it looks similar to an earlier one I did except for one minor detail. I have listed the problem and how far I've gotten and the similar problem I have done.
Don't worry, no pop-ups on this page. At least not with Netscape or Internet Explorer.