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INVARIANTS, TORSION INDICES AND ORIENTED COHOMOLOGY OF COMPLETE FLAGS

机译:完整旗标的不变性,扭转指数和定向同向性

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Let G be a split semisimple linear algebraic group over a field and let T be a split maximal torus of G. Let h be an oriented cohomology (algebraic cobordism, connective K-theory, Chow groups, Grothendieck's Ko, etc.) with formal'group law F. We construct a ring from F and the characters of T, that we call a formal group ring, and we define a characteristic ring morphism c from this formal group ring to h(G/B) where G/B is the variety of Borel subgroups of G. Our main result says that when the torsion index of G is inverted, c is surjective and its kernel is generated by elements invariant under the Weyl-group of G. As an application, we provide an algorithm to compute the ring structure of h(G/B) and to describe the classes of desingularized Schubert varieties and their products.
机译:令G为一个场上的一个分裂半简单线性代数群,令T为G的一个分裂最大圆环。令h为带形式'的定向同调学(代数同色异调,结缔K理论,Chow群,格罗腾迪克Ko等)。我们根据F和T的特征构造一个环,我们称其为形式环,并定义一个从该形式环到h(G / B)的特征环态素c,其中G / B为我们的主要结果表明,当G的扭转指数倒置时,c是射影,并且其内核是由G的Weyl群下不变的元素生成的。作为应用,我们提供了一种算法来计算h(G / B)的环结构,并描述去奇化的Schubert品种及其产品的类别。

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