Abstract

Since the publication of this chapter, Jim Kaput was killed in a tragic road accident. We have all lost an energetic, visionary, and dedicated colleague. Mathematics education research has lost one of its greatest exponents, a researcher who not only understood the world of education, but knew how to change it. His theoretical work on the evolution of notational systems—much of it presented in this chapter—as well as his practical contribution, most recently through SimCalc, is living testimony to the importance and impact of his work. And we have lost a friend: a friend with a wonderful sense of humor and wit, a vibrant sense of fun, and an inspired intelligence. We will miss him.