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11.
V. I. Zenkov 《Siberian Mathematical Journal》2016,57(6):1002-1010
Given a finite group G with socle isomorphic to L 2(q), q ≥ 4, we describe, up to conjugacy, all pairs of nilpotent subgroups A and B of G such that A ∩ B g ≠ 1 for all g ∈ G. 相似文献
12.
A. S. Kondrat’ev V. M. Levchuk V. I. Zenkov 《Proceedings of the Steklov Institute of Mathematics》2007,259(2):S163-S177
All finite semisimple groups are described in which the normalizers of pairwise intersections of Sylow 2-subgroups have odd indices; thereby, Problem 5.14(v) from the Kourovka Notebook is solved in the main. 相似文献
13.
V. I. Zenkov 《Proceedings of the Steklov Institute of Mathematics》2007,259(2):S250-S253
The author continues the investigation of intersections of Hall subgroups in finite groups. Previously, the author proved that in the case when a Hall subgroup is Sylow there are three subgroups conjugate to it such that their intersection coincides with the maximal normal primary subgroup. A similar assertion holds for Hall subgroups in solvable groups. The aim of this paper is to construct examples of a (nonsolvable) group in which the intersection of any four subgroups conjugate to some Hall subgroup is nontrivial. 相似文献
14.
A. V. Zenkov 《Siberian Mathematical Journal》2006,47(1):58-63
We consider some questions on covers in the lattice of varieties of m-groups. We prove the existence of a nonabelian cover of the smallest nontrivial variety of m-groups. We show that there exists an uncountable set of o-approximable varieties of m-groups each of which has continuum many o-approximable covers. In the lattice of o-approximable varieties of m-groups we find a variety that has no covers in this variety and no independent basis of identities. 相似文献
15.
16.
Zenkov I. S. Yakushev A. A. Abel A. S. Averin A. D. Bessmertnykh-Lemeune A. G. Beletskaya I. P. 《Russian Journal of Organic Chemistry》2021,57(9):1398-1404
Russian Journal of Organic Chemistry - Mixed-ligand ruthenium(II) complex with 2,2′-bipyridine and 1,10-phenanthroline-3,8-dicarboxylic acid with the composition... 相似文献
17.
18.
We argue that for any subgroup H of rank 1 in a multiplicative group of positive reals, among Dlab groups of the closed intervalI=[0],[1] on an extended set
of reals, there exist groups DH*(I) and DH* which lack normal relatively convex subgroups, are not simple groups, and have just two distinct linear orders. The cardinality
of a set of linear orders on Dlab groups is computed. It is established that every rigid l-group is Abelian if it belongs
to a varietyD of l-groups groups generated by the linearly ordered groups DH*(I) and DH*. We prove that the quasivariety q(DH*(I), DH*) of groups generated by DH*(I) and DH* is distinct from a quasivarietyO of all orderable groups. Similar results are stated for a variety of l-groups and the quasivariety of groups that are not
embeddable in DH*(I) and DH*.
Supported by RFFR grant No. 96-01-00088.
Translated fromAlgebra i Logika, Vol. 38, No. 5, pp. 531–548, September–October, 1999. 相似文献
19.
A. V. Zenkov 《Optics and Spectroscopy》2005,98(6):856-865
Specific features of the charge-transfer states and transitions of the O 2p → Co 3d type in octahedral complexes (CoO6)9? and (CoO6)10? are considered in the cluster approach. The reduced matrix elements of the electric dipole transition operator are calculated on the many-electron wave functions of the complexes corresponding to the initial (high-or low-spin) state and the final state at a charge-transfer transition. The energies of the many-electron charge-transfer transitions and their intensities are calculated within the Tanabe-Sugano theory taking into account the mixing of different configurations of the same symmetry. Simulation of the optical spectrum of cobaltites showed the presence of a wide band consisting of many lines due to the charge-transfer transitions. The results of the simulation are in agreement with experiment and demonstrate the limited validity of the generally accepted concepts of a simple structure of the spectrum of charge-transfer transitions. 相似文献
20.
A. V. Zenkov 《Physics of the Solid State》2005,47(3):451-458
Specific features of the charge-transfer states and O2p → V3d transitions in the (VO6)9? octahedral complex are studied using the cluster approach. The reduced matrix elements of the electric-dipole transition operator are calculated for many-electron wave functions corresponding to the initial and final states of a charge-transfer transition. Using a parameterization of the results, the relative intensities of the allowed charge-transfer transitions are calculated disregarding the mixing of different configurations of the same symmetry. The Tanabe-Sugano theory is used with inclusion of this mixing to calculate the energies of many-electron charge-transfer transitions and their actual intensities. Modeling of the optical spectrum of LaVO3 reveals a complicated charge-transfer transition band consisting of 81 lines. The main maxima of the band are in the range 6.3–7.3 eV. There are also additional maxima in the regions of ≈3 and ≈8–9 eV. The bandwidth is ≈10 eV. The results of model calculations are in agreement with experiments and demonstrate the weakness of the widely used assumption that the spectrum of charge-transfer transitions has a simple structure. 相似文献