Calculus: Single and Multivariable, 7th Edition
Book Preface
Calculus is one of the greatest achievements of the human intellect. Inspired by problems in astronomy, Newton and Leibniz developed the ideas of calculus 300 years ago. Since then, each century has demonstrated the power of calculus to illuminate questions inmathematics, the physical sciences, engineering, and the social and biological sciences.
Calculus has been so successful both because its central theme—change—is pivotal to an analysis of the natural world and because of its extraordinary power to reduce complicated problems to simple procedures. Therein lies the danger in teaching calculus: it is possible to teach the subject as nothing but procedures— thereby losing sight of both the mathematics and of its practical value. This edition of Calculus continues our effort to promote courses in which understanding and computation reinforce each other. It reflects the input of users at research universities, fouryear colleges, community colleges, and secondary schools, as well as of professionals in partner disciplines such as engineering and the natural and social sciences. Mathematical Thinking Supported by Theory and Modeling
The first stage in the development of mathematical thinking is the acquisition of a clear intuitive picture of the central ideas. In the next stage, the student learns to reason with the intuitive ideas in plain English. After this foundation has been laid, there is a choice of direction. All students benefit from both theory and modeling, but the balance may differ for different groups. Some students, such as mathematics majors, may prefer more theory, while others may prefermoremodeling. For instructors wishing to emphasize the connection between calculus and other fields, the text includes:
• A variety of problems from the physical sciences and engineering.
• Examples from the biological sciences and economics.
• Models from the health sciences and of population growth.
• Problems on sustainability.
• Case studies on medicine by David E. Sloane, MD.
Active Learning: Good Problems
As instructors ourselves, we know that interactive classrooms and wellcrafted problems promote student learning. Since its inception, the hallmark of our text has been its innovative and engaging problems. These problems probe student understanding in ways often taken for granted. Praised for their creativity and variety, these problems have had influence far beyond the users of our textbook. The Seventh Edition continues this tradition.Under our approach,which we call the “Rule of Four,” ideas are presented graphically, numerically, symbolically, and verbally, thereby encouraging students to deepen their understanding. Graphs and tables in this text are assumed to show all necessary information about the functions they represent, including direction of change, local extrema, and discontinuities.
Problems in this text include:
• Strengthen Your Understanding problems at the end of every section. These problems ask students to reflect on what they have learned by deciding “What is wrong?” with a statement and to “Give an example” of an idea.
• ConcepTests promote active learning in the classroom. These can be used with or without personal response systems (e.g., clickers), and have been shown to dramatically improve student learning. Available in a book or on the web at www.wiley.com/college/hugheshallett.
• Class Worksheets allow instructors to engage students in individual or group classwork. Samples are available in the Instructor’sManual, and all are on the web at www.wiley.com/college/hugheshallett.
• Data and Models Many examples and problems throughout the text involve datadriven models. For example, Section 11.7 has a series of problems studying the spread of the chikungunya virus that arrived in the US in 2013. Projects at the end of each chapter of the EText (at www.wiley.com/college/hugheshallett) provide opportunities for sustained investigation of realworld situations that can be modeled using calculus.
• Drill Exercises build student skill and confidence.
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September 4, 2018 
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