微积分（英文版·第八版）

　　The art of teaching， Mark Van Doren said， is the art of assisting discovery. I have tried to write a book that assists students in discovering calculus-both for its practical power and its surprising beauty. In this edition， as in the first seven editions， I aim to convey to the student a sense of the utility of calculus and develop technical competence， but I also strive to give some appreciation for the intrinsic beauty of the subject. Newton undoubtedly experienced a sense of triumph when he made his great discoveries. I want students to share some of that excitement.The emphasis is on understanding concepts. I think that nearly everybody agrees that this should be the primary goal of calculus instruction. In fact， the impetus for the current calculus reform movement came from the Tulane Conference in 1986， which formulated as their first recommendation：Focus on conceptual understanding.I have tried to implement this goal through the Rule of Three： Topics should be presented geometrically， numerically， and algebraically. Visualization， numerical and graphical experimentation， and other approaches have changed how we teach conceptual reasoning in fundamental ways. More recently， the Rule of Three has been expanded to become the Rule of Four by emphasizing the verbal， or descriptive， point of view as well.In writing the eighth edition my premise has been that it is possible to achieve conceptual understanding and still retain the best traditions of traditional calculus. The book contains elements of reform. but within the context of a traditional curriculum.

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