ABSTRACT
The text has touched on a lot of interesting topics and problems, and many
students may find within its pages ideas for their own research. Other students
may still be on the lookout for their own problems to tackle, so I shall list a
few (all are open-ended) that arise that I think are worth pursuing. All are (I
hope!) accessible to a graduate student, though some may be more suitable to
some students than others, depending on the mathematical and programming
backgrounds of the individual.
