Download Abelian Groups and Modules: International Conference in by James D. Reid, William J. Wickless (auth.), Paul C. Eklof, PDF

By James D. Reid, William J. Wickless (auth.), Paul C. Eklof, Rüdiger Göbel (eds.)

This quantity comprises the refereed lawsuits of the overseas convention on Abelian teams and Modules held on the Dublin Institute of expertise in eire, from August 10 until eventually August 14, 1998. The assembly introduced jointly greater than 50 researchers and graduate scholars from 14 international locations around the globe. In a sequence of 8 invited survey talks, specialists within the box awarded a number of energetic parts of study, including:

· virtually thoroughly decomposable abelian teams, Butler teams and nearly loose teams – the type challenge, and invariants of certain sessions of torsion-free abelian groups.
· completely projective teams, their automorphism teams and their crew earrings – questions on certain passage among those categories.
· Radicals commuting with products.
· The Ziegler spectra of Neumann usual earrings and the category (semi-) teams of Prüfer domains.
· The Krull-Schmidt estate for valuation domains.

These major talks have been followed by means of many different displays of present study on abelian teams and modules. tools from version thought, type concept, countless combinatorics, illustration thought, classical algebra and geometry have been utilized to the learn of abelian teams and modules; conversely, effects and techniques from abelian team concept have been utilized to basic module concept and non-commutative groups.

All this is often mirrored within the 30 articles during this quantity, which introduce the reader to an energetic and tasty a part of algebra that through the years has received a lot from its place on the crossroads of arithmetic. full of life discussions on the convention inspired the ultimate paintings at the awarded papers, which show a few experience of the highbrow ferment they generated and stimulate the reader to think about and actively examine the subjects and difficulties contained therein.

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Extra info for Abelian Groups and Modules: International Conference in Dublin, August 10–14, 1998

Example text

Then F has a pure free subgroup of rank equal to rk U(Z[B]). Proof. Put P = U(Z[B]) ~ U(E). Then PTjT has the same rank as P, as does its purification in U(E)jT :::! F. We shall assume that the purification is not free, and we will contradict F being of finite rank. 8 in [6], the unit group of Z[B] is finitely generated, hence PT jT is free and U (E) j PT cannot have bounded torsion. Therefore U(E)j PT has either elements of order p for infinitely many p, or else elements of order pe for one p and every e.

Then K[X]j n D[X] = 37 Abelian automorphism groups D[X]J sinee f is monie. We may let x be the eoset of X modulo the ideal generated by f in either polynomial ring, and regard D[x] ~ K[x]. Note that x E U(D). If c (j. KP, then XP - c is irredueible over K and K[x] = K(x) is a field. 3 Suppose c (j. KP. Then every root (x)U(D). 0/ unity in D[x] lies in Proof. Let qr be a prime power and ( a primitive q·r -th root of unity lying in D[x], but not in K. It suffiees to show that ( E (x)U(D). Sinee [K(x) ; K] = p and ( (j.

A brief lemma summarizes the properties we require. 9 Let cp : S -t Rand 'IjJ : T -t R be homomorphisms oJ rings. (1) IJ Sand T are torsion-Jree and reduced, then so is S (2) U(S XR T) = U(S) xU(R) XR T. U(T). (3) Suppose that U(S) = VI X V2, where CPIVI : VI -t U(R) is an isomorphism. Then U(S) XU(R) U(T) ~ V2 x U(T). Proof. Both (1) and (2) are easy, working in S x T. For (3), we may assurne V2 is the kernel of cp restricted to U(S). If Vi E Vi and t E U(T) such that CP(VI,V2) = 'IjJ(t), then the map sending ((VI,V2),t) to (V2,t) is an isomorphism.

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