This page is created as a supplement to the textbook

We believe that mathematics is a natural and deep part of human experience and that experiences of meaning in mathematics are accessible to everyone. Many formal aspects of mathematics have now been mechanized and this mechanization is widely available on personal computers, but the experiene of meaning in mathematics is still a human enterprise that is necessary for creative work. Our book is an expansion and revision of the book Experiencing Geometry on Plane and Sphere (1996) and the book Experiencing Geometry in Euclidean, Spherical, and Hyperbolic Spaces (2001). From feedback we have received from instructors using the first two editions of this book, we have learned that many of the most sucessful uses of this book in the classroom are when the instructors does not follow this book! It means that the chapters in this book have been used in a variety of different orders and at many different speeds. Instructors have used some of the problems from this book and then added their favorite problems. To welcome and encourage even more this creative approach to the teaching and using our book we will maintain this webpage.

  David <dwh2[at]cornell.edu> or Daina <dt34[at]cornell.edu>