For HW7, we found a few students copying / paraphrasing the solution manual of Rudin. You can take a look of the solution to Ch 4 here. Let me be clear.

• First of all, this is cheating and won't be tolerated. The first time you will only get a warning, and second time you will get an F for this class.
• Secondly, HW is only 20%. It doesn't really hurt if for some problems you didn't get it right, or have some gaps. It is a chance to try your best reasoning, and receive some feedback. It is a reason to have a discussion with your classmates.

In case that you didn't use the solution manual, and we mistagged you as so, then I apologize. But, please make an appointment with me, explain a bit how you think about this problem, then we can clear it.