Number theory is the branch of mathematics that is primarily concerned with the counting numbers. Of particular importance are the prime numbers, the 'building blocks' of our number system. The subject is an old one, dating back over two millennia to the ancient Greeks, and for many years has been studied for its intrinsic beauty and elegance, not least because several of its challenges are so easy to state that everyone can understand them, and yet no-one has ever been able to resolve them.

But number theory has also recently become of great practical importance - in the area of cryptography, where the security of your credit card, and indeed of the nation's defence, depends on a result concerning prime numbers that dates back to the 18th century. Recent years have witnessed other spectacular developments, such as Andrew Wiles's proof of 'Fermat's last theorem' (unproved for over 250 years) and some exciting work on prime numbers. In this Very Short Introduction Robin Wilson introduces the main areas of classical number theory, both ancient and modern. Drawing on the work of many of the greatest mathematicians of the past, such as Euclid, Fermat, Euler, and Gauss, he situates some of the most interesting and creative problems in the area in their historical context.

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About the Author

Robin Wilson received his Ph.D degree from the University of Pennsylvania for a thesis on number theory. He is an Emeritus Professor of Pure Mathematics at the Open University, Emeritus Professor of Geometry at Gresham College, London, and a former Fellow of Keble College, Oxford University. He is also a Visiting Professor at the LSE. A former President of the British Society for the History of Mathematics, he has written and edited over 40 books on the subject, including Lewis Carroll in Numberland (Penguin, 2008), Four Colours Suffice (Princeton University Press, 2009), Combinatorics: A Very Short Introduction (OUP, 2016), and Euler's Pioneering Equation (OUP, 2018). He has been awarded the Mathematical Association of America's Lester Ford award and P�lya prize for his 'outstanding expository writing', and the Stanton Medal for outreach activities in combinatorics by the Institute of Combinatorics and its Applications. He has Erdős Number 1.

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