Concluding remarks

Despite the amount of work involved, I think it is worthwhile to make the effort to revise the book, so that it can make its entrance into the next century. The revision includes an update with respect to the topics mentioned, as well as creating an online version with (hopefully) 'live' references. With the occurrence of the electronic classroom, ranging from the virtual networked classroom to the plain old classroom with a beamer, the book may prove its worth as a directly accessible source of material.