By Arjeh M. Cohen, Wim H. Hesselink, Wilberd L.J. van der Kallen, Jan R. Strooker
ISBN-10: 3540182349
ISBN-13: 9783540182344
From 1-4 April 1986 a Symposium on Algebraic teams used to be held on the collage of Utrecht, The Netherlands, in social gathering of the 350th birthday of the college and the sixtieth of T.A. Springer. well-known leaders within the box of algebraic teams and comparable parts gave lectures which coated large and significant parts of arithmetic. notwithstanding the fourteen papers during this quantity are often unique examine contributions, a few survey articles are integrated. Centering at the Symposium topic, such various subject matters are coated as Discrete Subgroups of Lie teams, Invariant thought, D-modules, Lie Algebras, exact services, team activities on types.
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Example text
F r o m this f o r m u l a , it is a p p a r e n t t h a t for orbit of x , B / m a p s k[@]® k[G i] into k ' g~) @ c G t h e adjoint k[@]® k[G i+l] ; we denote k / again B x the induced m a p on group homology 39 / Bx: H i ( G , k [ ~ ] ) ...... ; Hi+I(G, k [ ~ ] ) . , let 0 be its adjoint orbit, and define Bx" Hi(G x , k) > Hi+I(G x , k) b y decreeing t h e following d i a g r a m commutative H i(G x , k ) ~ H i(G,k[G]) / Hi+I (Gx , k) ~ where a Hi+I(G, k[O]) is Shapiro's isomorphism. To describe explicitly subgroup, M a , recall t h a t if F is a group, A a (left) A - m o d u l e , the (produced) F - m o d u l e t h e group of all m a p s F : F (i) F ( x .
Now let us recall some general concepts about 51 duality for complexes of modules over a non-necessarily c o m m u t a t i v e noetherian, unital ring A . We will a s s u m e t h a t homological dimension. A has finite global Our complexes of A-modules will be bounded complexes of finitely-generated A-modules. If M" is such a complex of left (resp. right) A-modules, its dual a d e q u a t e derived category -- as (M')* is defined -- in t h e ~ HomA (M" , A) . It is a complex of right (resp. left) A-modules, t h e action of A coming f r o m t h e action of A on may A by right (resp.
Comparison. The i n t r i g u i n g question, how the correspondences of Springer resp. 5) combine with Springer's and Joseph's correspondences to a commutative t r i a n g l e ? Or in other words: Is to p~, i f J corresponds to ~? In case o(J) equivalent G = SLn, the e x p l i c i t combinatorial des- c r i p t i o n s given above prove that t h i s is true. Barbasch and Vogan have v e r i f i e d t h i s 24 as a matter of f a c t f o r a l l cases, by an enormous amount of e x p l i c i t c a l c u l a t i o n s in [BVI,2].
Algebraic Groups by Arjeh M. Cohen, Wim H. Hesselink, Wilberd L.J. van der Kallen, Jan R. Strooker
by Brian
4.5