By the way, one thing that I keep meaning to say and keep not remembering to:

By all means, absolutely, feel free to work on homework in groups. It often helps a lot. It may or may not go faster, but it does seem to help people get a deeper understanding than they might have otherwise had.

If you do work with other people, put their names on the top, so I know who you worked with. Also, of course, you need to write up your own assignment, using your own words.