Open Problems

Abstract

We will give a list of problems that have not yet been resolved. This list complements the open problems (mainly directly related to material covered there) that have already been mentioned in the appropriate chapters. The difficulty of the problems ranges from fairly simple to (most likely) impossible to solve. The nature of a book such as this is that it provides a snapshot of what we know about the general theory, at a certain point in time. It should be clear that one might well find solutions to some of the (easier) problems listed here were one to work on them just another six months or a year.