### General description of solutions:

The solutions you find here are generally model answers given by students in
past years. The assignments are meant to be straightforward and to
have a clear correct answer. Each week when the solutions are posted, you should compare
your answers to the models and try to understand any differences between
them. If the model answer implies that you made a mistake but you don't see
what the mistake is, you should bring up the exercise in class or discuss it
with me outside of class.