We end the book with an introduction to complex numbers. We find the material both essential and beautiful. We want the literate student to have the language of complex numbers at hand, to know their algebra and see their geometry. We expect students to use computers or graphing calculators. These are an effective means for illustrating the geometry of the calculus and for exposing its infinite character.
Computers are native speakers of calculus.
Almost any graphing package will do. Many graphing calculators, as well as Mathematica, Maple, Derive and other computer packages, are sufficient for investigating the graphical aspects of calculus in this book. They are exceptionally easy to learn. Generally, students don't need extra class or instructor time to become adept at their use. Overview Conversational Calculus is a synthesis of the standard and reform curricula.