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New PDF release: Number Theory for Computing (2nd Edition)

By Song Y. Yan

ISBN-10: 3540430725

ISBN-13: 9783540430728


This e-book offers an excellent advent to the classical trouble-free quantity conception and the fashionable algorithmic quantity thought, and their purposes in computing and data know-how, together with desktops layout, cryptography and community protection. during this moment version proofs of many theorems were supplied, extra additions and corrections have been made.

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Extra info for Number Theory for Computing (2nd Edition)

Sample text

Let us first introduce some set-theoretic notation for numbers. (1) The set of natural numbers (positive integers, or counting numbers) N: N={1,2,3,···}. 9) Some authors consider 0 as a natural number. But like Kronecker 9 , we do not consider 0 as a natural number in this book. (2) The set of integers Z (the letter Z comes from the German word Ziihlcn): z = {0, ±1, ±2, ±3, . . }. 11) (ii) Z + to represent the set of positive integers: z+ = {1, 2, 3, ... 12) (iii) z>l to represent the set of positive integers greater than 1: z>l = {2,3,4,··.

The above proof of Euclid's theorem is based on the modern algebraic language. 3. Two other related elementary results about the infinitude of primes are as follows. 4. If n is an integer 2:: 1, then there is a prime p such that n < p:::; n! + 1. Proof. Consider the integer N = n! + 1. If N is prime, we may take p = N. If N is not prime, it has some prime factor p. ), which is ridiculous since N- n! = 1. Therefore, p > n. 5. Given any real number x 2:: 1, there exists a prime between x and 2x. eni;; I _,.

Similarly, if we know lcm(240, 560), we can find gcd(240, 560) by gcd(240, 560) = 240 · 560/1680 = 80. 3 Mersenne Primes and Fermat Numbers In this section, we shall introduce some basic concepts and results on Mersenne primes and perfect numbers. 8. A number is called a Mersenne 13 number if it is in the form of 13 Marin Mersenne (1588~1648) was a French monk, philosopher and mathematician who provided a valuable channel of communication between such contemporaries as Descartes, Fermat , Galileo and Pascal: "to inform Mersenne of a discovery is to publish it throughout the whole of Europe".

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Number Theory for Computing (2nd Edition) by Song Y. Yan

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