Imaginary Numbers Are Real Part 2 A Little History

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Want to learn more or teach this series? Check out the Imaginary Numbers are Real Workbook: http://www.welchlabs.com/resources. • Imaginary numbers are not some wild invention, they are the deep and natural result of extending our number system. Imaginary numbers are all about the discovery of numbers existing not in one dimension along the number line, but in full two dimensional space. Accepting this not only gives us more rich and complete mathematics, but also unlocks a ridiculous amount of very real, very tangible problems in science and engineering. • Part 1: Introduction • Part 2: A Little History • Part 3: Cardan's Problem • Part 4: Bombelli's Solution • Part 5: Numbers are Two Dimensional • Part 6: The Complex Plane • Part 7: Complex Multiplication • Part 8: Math Wizardry • Part 9: Closure • Part 10: Complex Functions • Part 11: Wandering in Four Dimensions • Part 12: Riemann's Solution • Part 13: Riemann Surfaces • Part 2 especially owes a debt to Paul Nahin's excellent book: An Imaginary Tale: The Story of sqrt(-1). Nahin presents a very thorough account of the development of imaginary numbers, which was invaluable in creating this series.

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