Download e-book for iPad: Adventures in Mathematics by Martin A Moskowitz

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By Martin A Moskowitz

ISBN-10: 9812386831

ISBN-13: 9789812386830

Even though effortless in nature, this ebook offers with basic matters in arithmetic — quantity, algebra, geometry (both Euclidean and non-Euclidean) and topology. those topics, on a complicated point, are an analogous ones with which a lot of present mathematical learn is anxious and have been themselves examine themes of prior sessions. the fabric is particularly appropriate either for complex highschool scholars and for students attracted to user-friendly arithmetic from the next perspective. it's going to even be very valuable to school academics looking an summary in their material.

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If c is a root of b(x) — 0, applying the Euclidean algorithm we get b(x) = p(x)(x — c) + r. Since r has degree 0, it is a constant. Evaluating at x = c tells us the constant is 0 and therefore b(x) = p(x)(x — c). Thus c is a root of a polynomial if and only if x — c is a factor. In particular a polynomial equation of degree n can have at most n roots, Now it follows from the Fundamental Theorem of Algebra that any polynomial p(z) of degree n and leading coefficient c with coefficients from C factors as p(z) = c(z — a\)...

S we may assume that p\ divides q\. But then p\ = qi. Multiplying by the inverses (in Q) we reduce ourselves to a problem with index set of lower order. Just keep going by induction and, after reordering, get r = s and pi = qi for all i. In view of the uniqueness of the prime factorization of an integer n we can group the prime divisors and write n = p^1 • • • pekk, the e, being positive integers. Each ej is called the multiplicity with which the prime Pi occurs. 5. There are infinitely many primes.

Now it is reasonable to ask if this situation can be described completely in terms of integers. The answer is yes and this can be done in a very useful way provided by the following result, first stated by Fermat, but actually proven by Euler. Although we are not in a position to prove it in this section, we will in the succeeding one. This result has applications to determining whether a large integer is prime or not. 44 Chapter 1 What is a Number? 6. A prime p > 2 £ Z, is a sum of squares of two integers if and only if it has the form p = An + 1, where n € Z.

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Adventures in Mathematics by Martin A Moskowitz


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