Algebraic Geometry IV: Linear Algebraic Groups Invariant by T. A. Springer (auth.), A. N. Parshin, I. R. Shafarevich

By T. A. Springer (auth.), A. N. Parshin, I. R. Shafarevich (eds.)

The difficulties being solved through invariant thought are far-reaching generalizations and extensions of difficulties at the "reduction to canonical shape" of varied is nearly an identical factor, projective geometry. gadgets of linear algebra or, what Invariant idea has a ISO-year heritage, which has obvious alternating sessions of development and stagnation, and alterations within the formula of difficulties, tools of resolution, and fields of software. within the final 20 years invariant idea has skilled a interval of development, influenced through a prior improvement of the idea of algebraic teams and commutative algebra. it's now seen as a department of the idea of algebraic transformation teams (and below a broader interpretation may be pointed out with this theory). we'll freely use the idea of algebraic teams, an exposition of which are came upon, for instance, within the first article of the current quantity. we are going to additionally imagine the reader knows the fundamental thoughts and least difficult theorems of commutative algebra and algebraic geometry; while deeper effects are wanted, we are going to cite them within the textual content or supply appropriate references.

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Next let (Vl' ... e. a sequence of distinct subspaces of V such that l'; c l';+l for i = 1, ... , s - 1. 1 then show that the group of all g E G such that g. l'; = l'; for i = 1, ... , s is a parabolic subgroup of G. 4 for a proof, as a consequence of general theory). A. Springer (b) G = SP2m. Let V = k 2m and define an alternating bilinear form on V by (x, y) = for x = (x;), Y = (y;) SP2m E m L (XiYm+i - i=l xm+iy;), V. Then = {g E GLnl(g. x, g. 2). A subspace W of V is totally isotropic for this bilinear form if (x, y) = 0 for all x, YEW One knows that then dim W ~ m.

W(n). I. Linear Algebraic Groups 37 These are cyclic permutations Wi = (i, i-I, ... ,2, 1) with l(w i ) = i-I. The decomposition of Y of the proposition is now the familiar paving of pn-l by affine spaces of dimensions 0, 1, ... , n - 1. 6. Semi-simple Groups. 6)) is trivial. G is quasi-simple if a proper closed normal subgroup of G is finite. Theorem. Let G be semi-simple. (i) There are finitely many non-trivial minimal closed, connected, normal subgroups of G, say G1 , ... , Gr. They commute mutually; (ii) The product homomorphism G1 x ...

Define G as before in the case of E 6 • Then the identity component of the group G defined as in the case of type E6 is a quasisimple linear algebraic group of type E 7 , which is simply connected. 6. Representation Theory. G is a connected reductive linear algebraic group. We fix a Borel group B and a maximal torus T contained in B. The character group of T is denoted by X and the root system of (G, T) by R. 5). 1. 3(a». 4) where VA = {v E VI¢J(t)v = ),(t)v for all t E T}. Lemma. Assume ¢J to be irreducible.

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