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Automorphisms of certain Borel subgroups over a connnected ring

机译:连通环上某些Borel子群的自同构

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Let G be the Chevalley-Demazure group scheme determined by a finite-dimensional complex simple Lie algebra L and its adjoint representation, R a commutative ring with identity and R* the multiplicative group consisting of all units in R. Denote by G(R) the Chevalley group over R with respect to G. Let Δ be a root system of L, Δ~+ the set of all positive roots with respect to some simple root system of Δ. Let E(R) be the elementary subgroup of G(R) and U(R) the upper triangular unipotent subgroup of E(R) generated by all x_α(t), t∈R, α∈ Δ~+. Let T(R) denote the standard maximal torus, which is isomorphic to the group Hom(P, R*) where P is the lattice spanned by Δ over the ring of integers Z. Let B(R) be the standard Borel subgroup of G(R) generated by the subgroups U(R) and T(R).
机译:令G为由有限维复简单李代数L及其伴随表示确定的Chevalley-Demazure群方案,R为具有同一性的交换环,R *为由R中的所有单元组成的乘法群。用G(R)表示设Δ是L的根系统,Δ〜+是关于Δ的某个简单根系统的所有正根的集合。设E(R)是G(R)的基本子组,而U(R)是由所有x_α(t),t∈R,α∈Δ〜+生成的E(R)的上三角单能子组。令T(R)表示标准最大圆环,它与Hom(P,R *)组同构,其中P是整数Z的环上由Δ跨越的晶格。令B(R)是Z的标准Borel子组由子组U(R)和T(R)生成的G(R)。

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