Download e-book for kindle: A Concise Introduction to the Theory of Numbers by Alan Baker

By Alan Baker

ISBN-10: 0521243831

ISBN-13: 9780521243834

ISBN-10: 0521286549

ISBN-13: 9780521286541

Quantity concept has a protracted and exclusive heritage and the innovations and difficulties with regards to the topic were instrumental within the beginning of a lot of arithmetic. during this booklet, Professor Baker describes the rudiments of quantity idea in a concise, easy and direct demeanour. although lots of the textual content is classical in content material, he contains many publications to extra learn to be able to stimulate the reader to delve into the nice wealth of literature dedicated to the topic. The e-book relies on Professor Baker's lectures given on the college of Cambridge and is meant for undergraduate scholars of arithmetic.

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Example text

In fact we have the stronger result that Iqn8- pn decreases as n increases. , a,, . , whence, for n r 1, we have 1 . thus we obtain I%@- pnI= l/(qn@n+~ +9n-1), and the assertion follows since, for n > 1, the denominator on the right exceeds 9n + qn-1 = ( a n + 1)qn-1 + qn-z> %-,On + qn-2, and, for n = 1, it exceeds 8,. 8 - pn and qn+18- pn+ 1 have opposite signs, we obtain 198- pl=Iu(qn@- ~ n ) + o ( q n + l @pn+l)I ~Iqn8as required. As a corollary, we deduce that if a rational p/q satisfies 18-p/ql

Ix) Assuming Kronecker's theorem and the transcendence of en, show that, for any primes pl, . , m. ' Quadratic fields 1 Algebraic number fields Although we shall be concerned in the sequel only with quadratic fields, we shall nevertheless begin with a short discussion of the more general concept of an algebraic number field. The theory relating to such fields has arisen from attempts to solve Fermat's last theorem and it is one of the most beautiful and profound in mathematics, Let a be an algebraic number with degree n and let P be the minimal polynomial for a (see 5 5 of Chapter 6).

Most of these were of an ad-hoc nature, the arguments involved being specifically related to the example under consideration, and there was little evidence of a coherent theory. In 1900, as the tenth of his famous list of 23 problems, Hilbert asked for a universal algorithm for deciding whether or not an equation of the form f(xl, . . , xn)= 0, where f denotes a polynomial with integer coefficients, is soluble in integers XI,. ,xn. The problem was resolved in the negative by Matiyasevich, developing ideas of Davis, Robinson and Putnam on recursively enumerable sets.

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A Concise Introduction to the Theory of Numbers by Alan Baker


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