by Leung Yiu-chung. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1994. / Includes bibliographical references (leaves 79-81). / Introduction / Chapter 1 --- Preliminaries --- p.1 / Chapter 1.1 --- Chain Conditions --- p.4 / Chapter 1.2 --- Categories of Modules --- p.5 / Chapter 1.3 --- Projectivity and Injectivity --- p.5 / Chapter 2 --- Generalization on CS modules --- p.11 / Chapter 2.1 --- Introduction --- p.11 / Chapter 2.2 --- Preliminaries --- p.12 / Chapter 2.3 --- CS ring ´ؤ A generalization of injectivity --- p.16 / Chapter 2.4 --- GCS ring ´ؤ A further generalization of CS ring --- p.19 / Chapter 2.5 --- Generalized CS-modules --- p.24 / Chapter 2.5.1 --- Direct Sum of Uniform Modules --- p.25 / Chapter 2.5.2 --- GCS modules as direct sum of uniform modules --- p.28 / Chapter 3 --- Ascending Chain Condition on Essential Submodules --- p.35 / Chapter 3.1 --- Introduction --- p.35 / Chapter 3.2 --- Preliminaries --- p.36 / Chapter 3.3 --- Continuous rings with ACC on essential ideals --- p.38 / Chapter 3.4 --- Analogous Results On CS-modules --- p.44 / Chapter 3.5 --- Weak CS -modules --- p.50 / Chapter 3.5.1 --- Decomposition of Weak CS-modules --- p.53 / Chapter 3.6 --- Generalization of GCS-modules --- p.54 / Chapter 3.7 --- On CESS-modules --- p.57 / Chapter 3.7.1 --- On the decomposition of CESS-modules --- p.59 / Chapter 4 --- Non-Singular Rings --- p.63 / Chapter 4.1 --- CS-modules and CS-endomorphism rings --- p.63 / Chapter 4.2 --- Categorical Equivalence and Morita Equivalence --- p.70 / Chapter 4.3 --- Categories of CS-modules --- p.74 / Bibliography --- p.79

by Chui Chee Ping. / Thesis (M.Ph.)--Chinese University of Hong Kong, 1987. / Bibliograhph: leaves 47-49.

<p> This thesis gives characterizations for all the injective and projective objects in the categories of compact, totally disconnected, distributive topological lattices, and compact, distributive topological lattices. It also contains known results concerning distributive lattices and Hausdorff topological spaces.</p> / Thesis / Master of Science (MSc)

<p> By an injective hull of a module M over any ring we mean a minimal injective extension module E ≥ M. Our main objective in this thesis is to find an explicit description of injective hulls of modules in some special cases and to study their properties.</p> / Thesis / Doctor of Philosophy (PhD)

Made available in DSpace on 2015-05-15T11:46:25Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 450936 bytes, checksum: 7e53189000f5416171ee58a4623b8aa6 (MD5) Previous issue date: 2010-02-09 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / Bertholf and Walls provided a characterization for the class of groups quasi-injective finite. Furthermore, Juriaans, Bastos Azevedo and give a rating for the injective type groups, which are a distinct class of the former despite being quite close. / Bertholf e Walls forneceram uma caracterização para a classe de grupos quasi-injetivos finitos. Além disso, Juriaans, Bastos e Azevedo dão uma classificação para os grupos do tipo injetivo, os quais são uma classe distinta da anterior apesar de serem bastante próximas.

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In the first chapter we give an outline of classical KRULL rings as in SAMUEL (1964), BOURBAKI (1965) and FOSSUM (1973). In the second chapter we introduce two notions important to our treatment of KRULL theory. The first is injective modules and.the second torsion theories. We then look at injective modules over Noetherian rings as in MATLIS [1958] and then over KRULL rings as in BECK [1971]. We show that for a KRULL ring there is a torsion theory (N,M) where N is the pseudo-zero modules and M the set of N-torsion-free (BECK calls these co-divisorial) modules. From LAMBEK [1971] there is a full abelian sub category C, namely the category of N-torsion-free, N-divisible modules, with exact reflector. We show in C (I) every direct sum of injective modules is injective and (II) C has global dimension at most one. It is these two properties that we exploit in the third chapter to give another characterization of KRULL rings. Then we generalize this to rings with zero-divisors and find that (i) R has to be reduced (ii) the ring is KRULL if and only if it is a finite product of fields and KRULL domains (iii) the injective envelope of the ring is semi-simple artinian. We then generalize the ideas to rings of higher dimension.

Classical homological algebra is done in a category of modules beginning with the study of projective and injective modules. This dissertation investigates analogous notions of projectivity and injectivity in a category of filtered modules. This category is similar to one studied by Sjödin, Nǎstǎsescu, and Van Oystaeyen. In particular, projective and injective objects with respect to the restricted class of strict morphisms are defined and characterized. Additionally, an analogue to the injective envelope is discussed with examples showing how this differs from the usual notion of an injective envelope.

O objetivo desta dissertação é estudar a caracterização dos módulos injetivos sobre anéis noetherianos e comutativos, dada por Eben Matlis em [16], como soma direta de módulos da forma E(A P ). Assim, discutimos algumas propriedades dos mó- dulos injetivos indecomponíveis sobre esses tipos de anéis. Em particular, mostramos que o completamento do anel local Ap é isomorfo ao anel HomA(E(A P );E(A P )). A partir disso, mostramos que, quando o anel for comutativo, noetheriano, local e completo, então a categoria dos módulos noetherianos e a categoria dual dos módulos artinianos são equivalentes. / The goal of this work is to study the characterization of injective modules over Noetherian and commutative rings, given by Eben Matlis in [16], as a direct sum of modules of the form E(A P ). Thus, we discuss some properties of injective indecomposable modules over these types of rings. In particular, we show that the completion of the local ring Ap is isomorphic to the ring HomA(E(A P );E(A P )). From this, we show that, when a ring is commutative, noetherian, local and complete, the category of the Noetherian modules and the dual category of Artinian modules are equivalent.

O objetivo desta dissertação é estudar a caracterização dos módulos injetivos sobre anéis noetherianos e comutativos, dada por Eben Matlis em [16], como soma direta de módulos da forma E(A P ). Assim, discutimos algumas propriedades dos mó- dulos injetivos indecomponíveis sobre esses tipos de anéis. Em particular, mostramos que o completamento do anel local Ap é isomorfo ao anel HomA(E(A P );E(A P )). A partir disso, mostramos que, quando o anel for comutativo, noetheriano, local e completo, então a categoria dos módulos noetherianos e a categoria dual dos módulos artinianos são equivalentes. / The goal of this work is to study the characterization of injective modules over Noetherian and commutative rings, given by Eben Matlis in [16], as a direct sum of modules of the form E(A P ). Thus, we discuss some properties of injective indecomposable modules over these types of rings. In particular, we show that the completion of the local ring Ap is isomorphic to the ring HomA(E(A P );E(A P )). From this, we show that, when a ring is commutative, noetherian, local and complete, the category of the Noetherian modules and the dual category of Artinian modules are equivalent.