## Read e-book online A First Course in Module Theory PDF

By Mike E Keating

ISBN-10: 186094096X

ISBN-13: 9781860940965

Some time past 20 years, there was nice growth within the concept of nonlinear partial differential equations. This publication describes the development, targeting fascinating themes in fuel dynamics, fluid dynamics, elastodynamics and so on. It comprises ten articles, each one of which discusses a really fresh consequence acquired via the writer. a few of these articles overview similar effects earrings and beliefs; Euclidean domain names; modules and submodules; homomorphisms; quotient modules and cyclic modules; direct sums of modules; torsion and the first decomposition; displays; diagonalizing and inverting matrices; becoming beliefs; the decomposition of modules; general varieties for matrices; projective modules; tricks for the workouts

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Extra resources for A First Course in Module Theory

Sample text

I = Rp with p irreducible. 1, R/I is a field if and only if I is a maximal ideal of R. But I = Ra for some element a of R, and it is clear that Ra is maximal precisely when a is irreducible. 12. 12 29 Residue rings of polynomial rings Let F[X] be the polynomial ring over a field F, and let / = /o + fxX + ■ ■ ■ + fn-iXn~l +Xn,n = deg(/) > 1 be a monic polynomial in F[X], Our aim is to give an explicit description of the residue ring F[X\/F[X]f that we need in subsequent applications. We show that each element of F[X]/F[X]f can be written as a polynomial 90 + 9ie + 92£2 H 1- 3 n - i « n _ 1 where e is a root of / .

An R-submodule of M is a subset L of M which satisfies the following requirements. SubM 1: 0 6 L. SubM 2: If I, /' € L, then I + I' e L also. SubM 3: HI € L and r £ R, then rl € L also. R-module, since the axioms for addition and scalar multiplication already hold in the larger module M. -submodule. R-submodule of a right module M is defined by making the obvious modification to axiom SubM 3: SubMR 1: HI € L and r £ R, then Ir € L also. Clearly, a submodule of a right /^-module is again a right module.

Deduce that A is a root of f(X) if and only if X - A | f{X). 8 33 Let p e Z b e prime. Arguing directly from Gauss's Lemma, show that the polynomials Xn — p are all irreducible for n > 2. Generalize your argument to a proof of Eisenstein's Criterion. Let R be a Euclidean domain and let a in R be neither a unit nor irreducible. Show that the ring R/Ra contains a nontrivial divisor of 0. Let f(Y) = f(Y + 1) be the polynomial obtained by the change of variable X = Y +1 from f(X) € F[X], F a field.