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Homological Algebra [electronic resource]: The Interplay of Homology With Distributive Lattices and Orthodox Semigroups

Marco Grandis
Format
EBook; Book; Online
Published
Singapore ; Hackensack, N.J. : World Scientific, [2012]
Language
English
ISBN
9789814407069, 9814407062
Abstract
In this book we want to explore aspects of coherence in homological algebra, that already appear in the classical situation of abelian groups or abelian categories. Lattices of subobjects are shown to play an important role in the study of homological systems, from simple chain complexes to all the structures that give rise to spectral sequences. A parallel role is played by semigroups of endorelations. These links rest on the fact that many such systems, but not all of them, live in distributive sublattices of the modular lattices of subobjects of the system. The property of distributivity allows one to work with induced morphisms in an automatically consistent way, as we prove in a 'Coherence Theorem for homological algebra'. (On the contrary, a 'non-distributive' homological structure like the bifiltered chain complex can easily lead to inconsistency, if one explores the interaction of its two spectral sequences farther than it is normally done.) The same property of distributivity also permits representations of homological structures by means of sets and lattices of subsets, yielding a precise foundation for the heuristic tool of Zeeman diagrams as universal models of spectral sequences. We thus establish an effective method of working with spectral sequences, called 'crossword chasing', that can often replace the usual complicated algebraic tools and be of much help to readers that want to apply spectral sequences in any field.
Contents
  • Introduction
  • 1. Coherence and models in homological algebra
  • 2. Puppe-exact categories, orthodoxy. 2.8. Weak induction and the distributive expansion
  • 3. Involutive categories
  • 4. Categories of relations as RE-categories
  • 5. Theories and models
  • 6. Homological theories and their universal models
  • Appendix A. Some points of category theory
  • Appendix B. A proof for the universal exact system.
Description
Mode of access: World wide Web.
Notes
Includes bibliographical references (pages 357-361) and index.
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