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1. The Subject Matter. Consider a complex semisimple Lie group G with Lie algebra g and Weyl group W. In this book, we present a geometric perspective on the following circle of ideas: polynomials The "vertices" of this graph are some of the most important objects in representation theory. Each has a theory in its own right, and each has had its own independent historical development. - A nilpotent orbit is an orbit of the adjoint action of G on g which contains the zero element of g in its closure. (For the special linear group 2 G = SL(n,C), whose Lie algebra 9 is all n x n matrices with trace zero, an adjoint orbit consists of all matrices with a given Jordan canonical form; such an orbit is nilpotent if the Jordan form has only zeros on the diagonal. In this case, the nilpotent orbits are classified by partitions of n, given by the sizes of the Jordan blocks.) The closures of the nilpotent orbits are singular in general, and understanding their singularities is an important problem. - The classification of irreducible Weyl group representations is quite old.
This monograph tells the story of a philosophy of J-P. Serre and his vision of relating that philosophy to problems in affine algebraic geometry. It gives a lucid presentation of the Quillen-Suslin theorem settling Serre's conjecture. The central topic of the book is the question of whether a curve in $n$-space is as a set an intersection of $(n-1)$ hypersurfaces, depicted by the central theorems of Ferrand, Szpiro, Cowsik-Nori, Mohan Kumar, Boratynsk.
The book gives a comprehensive introduction to basic commutative algebra, together with the related methods from homological algebra, which will enable students who know only the fundamentals of algebra to enjoy the power of using these tools. At the same time, it also serves as a valuable reference for the research specialist and as
potential course material, because the authors present, for the first time in book form, an approach here that is an intermix of classical algebraic K-theory and complete intersection techniques, making connections with the famous results of Forster-Swan and Eisenbud-Evans. A study of projective modules and their connections with topological vector bundles in a form due to Vaserstein is included. Important subsidiary results appear in the copious exercises.
Even this advanced material, presented comprehensively, keeps in mind the young student as potential reader besides the specialists of the subject.
S. A. Lloyd proposes a radically new interpretation of Hobbes's Leviathan that shows transcendent interests--interests that override the fear of death--to be crucial to both Hobbes's analysis of social disorder and his proposed remedy to it. Most previous commentators in the analytic philosophical tradition have argued that Hobbes thought that credible threats of physical force could be sufficient to deter people from political insurrection. Professor Lloyd convincingly shows that because Hobbes took the transcendence of religious and moral interests seriously, he never believed that mere physical force could ensure social order. Lloyd's interpretation demonstrates the ineliminability of that half of Leviathan devoted to religion, and attributes to Hobbes a much more plausible conception of human nature than the narrow psychological egoism traditionally attributed to Hobbes.
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