I think one of the authors has an interesting point about the different expectations in different classes (etc.). As a physics undergrad and grad student we we

I think one of the authors has an interesting point about the different expectations in different classes (etc.). As a physics undergrad and grad student we were always permitted and encouraged to work on our problem sets together. Most of my memories of classes revolve around sitting in a room full of sleep deprived classmates trying to finish our problems at about 2am. In contrast, a friend of mine teaches physics at a university in the UK and is prohibited by the university plagiarism code from letting his students collaborate on homework. He thinks it's insane, but he has no choice. Even if he explicitly allows his students to work together, they can still be found guilty of cheating... Different academic cultures I guess.