Download PDF by David J Winter: Abstract Lie Algebras

By David J Winter

ISBN-10: 0486783464

ISBN-13: 9780486783468

Solid yet concise, this account of Lie algebra emphasizes the theory's simplicity and gives new ways to significant theorems. writer David J. iciness, a Professor of arithmetic on the collage of Michigan, additionally offers a basic, vast therapy of Cartan and similar Lie subalgebras over arbitrary fields.

Preliminary fabric covers modules and nonassociate algebras, by way of a compact, self-contained improvement of the idea of Lie algebras of attribute zero. themes comprise solvable and nilpotent Lie algebras, Cartan subalgebras, and Levi's radical splitting theorem and the full reducibility of representations of semisimple Lie algebras. extra matters contain the isomorphism theorem for semisimple Lie algebras and their irreducible modules, automorphism of Lie algebras, and the conjugacy of Cartan subalgebras and Borel subalgebras. an intensive concept of Cartan and comparable subalgebras of Lie algebras over arbitrary fields is built within the final...

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Let where the are -irreducible. Since is a nilpotent ideal of is a nonzero -submodule of and by the -irreducibility of . ) Thus, . Since is central. 5. Thus, . 7 Theorem (Lie) Let be a solvable Lie algebra over k, and let be a finite-dimensional irreducible Lie module for over k. Suppose that has a Cartan sub-algebra such that every is split on over k. Then dim . PROOF. Assume that ≠ {0}. 3. Now is an -submodule, so , by the -irreducibility of . Thus, and we may regard as an -module, . Now is Abelian and , so and .

Then where the are simple ideals each of which have nondegenerate Killing form. PROOF. 5, the restriction of K ( , ) to is nondegenerate and is the Killing form of . 6 Theorem (Zassenhaus) Let have nondegenerate Killing form. Then ad = Der . PROOF. Let (D, E) = Trace DE for D, . Then ( , ) is an invariant form on Der , and is nondegenerate since it is the Killing form. 5, for each there exists ad such that [ad y, D] = [ad y, ad x] for all ad . Thus ad(yD) = ad(y ad x) for all . To show that D = ad x, it therefore suffices to show that ad is injective or that = Kernel ad is {0}.

Then every ideal of is a sum of certain of the . In particular, the are the only simple ideals of . PROOF. 4. Thus, has an -complement . Now is an ideal of and . Since , we have and . But is an ideal of so that or . Thus, is the sum of those with . 6. Definition is semisimple if has no nonzero solvable ideal. If is finite dimensional, then /Rad is semisimple, and is semisimple iff Rad . 5. The converse of this is not always true, but is true provided that possess a suitable nondegenerate bilinear form.

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Abstract Lie Algebras by David J Winter


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