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The simple modules for electrical Lie algebra of type D5 were investigated. The sufficient and necessary criteria of the simple Z-graded highest weight modules were established by means of determining the singular vectors of the Verma modules. The simple highest weight module is isomorphic to either that for the symplectic Lie algebra sp4 or Verma module. 相似文献
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直流电源作为继电保护、测控、通讯自动化、事故照明、断路器、隔离开关操作机构等设备的工作电源,其供电的可靠性直接关系到变电站的安全稳定运行,因此防止直流系统各馈线支路供电故障就是我们迫切需要解决的问题,对宜昌供电公司220kV变电站直流系统供电方式的现状进行了详细的调查,找出了影响馈线支路供电可靠性的共性问题并提出了最佳的改进方案,使完善后的直流系统简洁清晰,满足直流系统供电的安全、稳定性。 相似文献
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As well known, a normal orthogroup is a strong semilattice of rectangular groups. In this paper, we consider the homomorphisms between normal orthogroups and endomorphisms of themselves, relating them to the homomorphisms and endomorphisms of the underlying rect-angular groups with their compositions. 相似文献
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In a recent article by Liu,Pei,and Zhu,Lie bialgebra structures on the twisted Heisenberg-Virasoro algebra were determined. By disposing the indexing set, the generalized Heisenberg-Virasoro algebra was considered. It is proved that all Lie bialgebra structures on centerless generalized Heisenberg-Virasoro algebra L are coboundary triangular by proving that the first cohomology group H1 (L,V) =0. 相似文献
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In algebra, the Jacobson-Bourbaki theorem is especially useful for generalizations of the Galois theory of finite, normal and separable field extensions. It was obtained by Jacobson for fields and extended to division rings by Jacobson and Cartan who credited the result to unpublished work by Bourbaki. In 2005, the Jacobson-Bourbaki correspondence theorem for commutative rings was formulated by Winter. And this theorem for augmented rings was formulated by Kadison in 2012. In this paper, we prove the Jacobson-Bourbaki theorem for noncommutative rings which is finitely generated over their centers. We establish a bijective correspondence between the set of subdivisions which are right finite codimension in A and the set of Galois rings of the additive endomorphisms End A of A which is finitely generated over its center. 相似文献
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