A comprehensive course in number theory by Alan Baker

By Alan Baker

Built from the author's renowned textual content, A Concise creation to the speculation of Numbers, this e-book presents a accomplished initiation to all of the significant branches of quantity conception. starting with the rudiments of the topic, the writer proceeds to extra complex themes, together with parts of cryptography and primality checking out, an account of quantity fields within the classical vein together with homes in their devices, beliefs and perfect periods, elements of analytic quantity conception together with reviews of the Riemann zeta-function, the prime-number theorem and primes in arithmetical progressions, an outline of the Hardy-Littlewood and sieve equipment from respectively additive and multiplicative quantity concept and an exposition of the mathematics of elliptic curves. The ebook contains many labored examples, routines and additional analyzing. Its wider insurance and flexibility make this publication compatible for classes extending from the undemanding to starting graduate reports.

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Let now p be an odd prime and suppose that (a, p) = 1. Further, let a j be the numerically least residue of a j (mod p) for j = 1, 2, . . Then Gauss’ lemma states that a = (−1)l , p where l is the number of j ≤ 12 ( p − 1) for which a j < 0. 30 Quadratic residues For the proof we observe that the numbers |a j | with 1 ≤ j ≤ r , where r = are simply the numbers 1, 2, . . , r in some order. For certainly we have 1 ≤ |a j | ≤ r , and the |a j | are distinct since a j = − ak , with k ≤ r , would give a( j + k) ≡ 0 (mod p) with 0 < j + k < p, which is impossible, and a j = ak gives a j ≡ ak (mod p), whence j = k.

Finally we deduce that, for any natural number n, there exists a primitive root (mod n) if and only if n has the form 2, 4, p j or 2 p j , where p is an odd prime. Clearly 1 and 3 are primitive roots (mod 2) and (mod 4). Further, if g is a primitive root (mod p j ) then the odd element of the pair g, g + p j is a primitive root (mod 2 p j ), since φ(2 p j ) = φ( p j ). Hence it remains only to prove the necessity of the assertion. Now if n = n 1 n 2 , where (n 1 , n 2 ) = 1 and n 1 > 2, n 2 > 2, then there is no primitive root (mod n).

Xiii) Prove that, for any prime p, the sum of all the distinct primitive roots (mod p) is congruent to μ( p − 1) (mod p). (xiv) Prove that, for a prime p > 3, the product of all the distinct primitive roots (mod p) is congruent to 1 (mod p). p (xv) Prove that if p is a prime and k is a positive integer then n=1 n k is congruent (mod p) to −1 if p − 1 divides k and to 0 otherwise. (xvi) Determine all the solutions of the congruence y 2 ≡ 5x 3 (mod 7) in integers x, y. (xvii) Prove that, for any prime p > 3, the numerator of 1 + 12 + · · · + 1/( p − 1) is divisible by p 2 (Wolstenholme’s theorem).

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