For ALL homework problems you ARE NOT permitted to consult the solutions from problems given in previous years (in any form including having someone who solved the problem last year describe his/her solution or the provided solution to you).
In solving your homework problems, you may discuss approaches to solving the homework problems with your classmates, HOWEVER, you are to work out all details of any solutions discussed and write up the solution completely on your own. Also you must clearly acknowledge anyone (besdies Dan and I) with whom you discussed any problem and say briefly what you discussed .
Violations of any of the above rules will be dealt with harshly! These homework problems are designed to help you learn the material being taught. Being told the solution and understanding it is VERY different from working through the process of actually finding a solution. If you do not take an active role in the process of solving the homework problems, then you won't get much out of it, hence you won't learn the material and you are unlikely to pass the exams.