Number Theory

Download e-book for kindle: A comprehensive course in number theory by Alan Baker

By Alan Baker

Built from the author's renowned textual content, A Concise advent to the idea of Numbers, this e-book offers a accomplished initiation to the entire significant branches of quantity thought. starting with the rudiments of the topic, the writer proceeds to extra complex issues, together with parts of cryptography and primality checking out, an account of quantity fields within the classical vein together with houses in their devices, beliefs and excellent periods, points of analytic quantity thought together with stories of the Riemann zeta-function, the prime-number theorem and primes in arithmetical progressions, an outline of the Hardy-Littlewood and sieve tools from respectively additive and multiplicative quantity conception and an exposition of the mathematics of elliptic curves. The booklet contains many labored examples, workouts and additional studying. Its wider insurance and flexibility make this e-book compatible for classes extending from the basic to starting graduate stories.

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Example text

3 Gauss’ lemma For any integer a and any natural number n we define the numerically least residue of a (mod n) as that integer a for which a ≡ a (mod n) and − 12 n < a ≤ 12 n. 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, .

Xn ) ≡ 0 (mod p j ), where f is a polynomial with integer coefficients, leads to the concept of p-adic numbers and to deep theories in the realm of algebraic geometry; see, for example, Borevich and Shafarevich, Number Theory (Academic Press, 1966), and Weil, ‘Numbers of solutions of equations in finite fields’, Bull. American Math. Soc. 55 (1949), 497–508. 7 Exercises (i) Determine the primes p for which 5 is a quadratic residue (mod p). (ii) Show that if p is a prime ≡ 3 (mod 4) and if p = 2 p + 1 is a prime then 2 p ≡ 1 (mod p ).

The complete solution is x ≡ −18 (mod 385). As another example, consider the congruences x ≡ 1 (mod 3), x ≡ 2 (mod 10), x ≡ 3 (mod 11). A solution is given by x = 110x1 + 33x2 + 30x3 , where x1 , x2 , x3 satisfy 2x1 ≡ 1 (mod 3), 3x2 ≡ 2 (mod 10), 8x3 ≡ 3 (mod 11). Again solving by inspection, we get x1 = 2, x2 = 4, x3 = 10, which gives x = 652. The complete solution is x ≡ −8 (mod 330). † This is currently the most common of several standard notations; they include Z/ pZ, Z/ p and GF( p) (the Galois field with p elements).

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