In this chapter we are largely influenced in our choice of material by the demands of the rest of the book. However, we take the view that this is an opportunity for the student to grasp basic categorical notions which permeate so much of mathematics today, including, of course, algebraic topology, so that we do not allow ourselves to be rigidly restricted by our immediate objectives. A reader totally unfamiliar with category theory may find it easiest to restrict his first reading of Chapter II to Sections 1 to 6; large parts of the book are understandable with the material presented in these sections. Another reader, who had already met many examples of categorical formulations and concepts might, in fact, prefer to look at Chapter II before reading Chapter I. Of course the reader thoroughly familiar with category theory could, in principal, omit Chapter II, except perhaps to familiarize himself with the notations employed. In Chapter III we begin the proper study of homological algebra by looking in particular at the group ExtA(A, B), where A and Bare A-modules. It is shown how this group can be calculated by means of a projective presentation of A, or an injective presentation of B; and how it may also be identified with the group of equivalence classes of extensions of the quotient module A by the submodule B.
Le informazioni nella sezione "Riassunto" possono far riferimento a edizioni diverse di questo titolo.
I. Modules.- II. Categories and Functors.- III. Extensions of Modules.- IV. Derived Functors.- V. The Künneth Formula.- VI. Cohomology of Groups.- VII. Cohomology of Lie Algebras.- VIII. Exact Couples and Spectral Sequences.- IX. Satellites and Homology.
Le informazioni nella sezione "Su questo libro" possono far riferimento a edizioni diverse di questo titolo.
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Paperback. First ition Thus edition. Very Good/Wraps (31143) . Paperback, First Edition thus. About Very Good. There is some underlining in the first few pages, but appears to be clean after that. Spine is sun-faded. Overall, quite nice and usable. Graduate Texts in Mathematics, Volume 4. Codice articolo 31143
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Paperback. Condizione: Very Good. Series: Graduate Texts in Mathematics. x 338p paperback, white and yellow covers, very good condition, a little light wear to covers, spine sunned, one or two light marks to edges and endpapers, pages otherwise very clear and bright, no annotations or highlighting, binding firm, a good copy of an uncommon volume Language: English Weight (g): 500. Codice articolo 233741
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