Download e-book for kindle: Algebra. Abstract and Concrete by Frederick M. Goodman

By Frederick M. Goodman

ISBN-10: 0130673420

ISBN-13: 9780130673428

This advent to fashionable or summary algebra addresses the normal subject matters of teams, jewelry, and fields with symmetry as a unifying subject, whereas it introduces readers to the energetic perform of arithmetic. Its obtainable presentation is designed to educate clients to imagine issues via for themselves and alter their view of arithmetic from a approach of principles and systems, to an area of inquiry. the quantity offers considerable workouts that supply clients the chance to take part and examine algebraic and geometric principles that are fascinating, very important, and value brooding about. the quantity addresses algebraic issues, uncomplicated conception of teams and items of teams, symmetries of polyhedra, activities of teams, jewelry, box extensions, and solvability and isometry teams. For these attracted to a concrete presentation of summary algebra.

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Example text

Let f; g 2 KŒx. g/; in particular, if f and g are both nonzero, then fg ¤ 0. 8. g/g. Proof. 3. ■ We say that a polynomial f divides a polynomial g (or that g is divisible by f ) if there is a polynomial q such that f q D g. 6. 6, with the proofs also following a nearly identical course. In this discussion, the degree of a polynomial plays the role that absolute value plays for integers. 6. Let f , g, h, u, and v denote polynomials in KŒx. (a) If uv D 1, then u; v 2 K. (b) If f jg and gjf , then there is a k 2 K such that g D kf .

This happens precisely when the distance between the two numbers on the number line is some multiple of n, so that the interval between the two numbers on the number line wraps some integral number of times around the clock face. 1. mod n/ if a b is divisible by n. mod n/ has the following properties: ✐ ✐ ✐ ✐ ✐ ✐ “bookmt” — 2006/8/8 — 12:58 — page 38 — #50 ✐ 38 ✐ 1. 2. mod n/. mod n/. mod n/. Proof. For (a), a a D 0 is divisible by n. For (b), a b is divisible by n if, and only if, b a is divisible by n.

B C Œc/ D ŒaŒb C ŒaŒc: Multiplication in Zn has features that you might not expect. On the one hand, nonzero elements can sometimes have a zero product. For example, in Z6 , Œ4Œ3 D Œ12 D Œ0. We call a nonzero element Œa a zero divisor if there exists a nonzero element Œb such that ŒaŒb D Œ0. Thus, in Z6 , Œ4 and Œ3 are zero divisors. On the other hand, many elements have multiplicative inverses; an element Œa is said to have a multiplicative inverse or to be invertible if there exists an element Œb such that ŒaŒb D Œ1.

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Algebra. Abstract and Concrete by Frederick M. Goodman

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