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In this article, we introduce the algebra of block-symmetric cylinders and we show that symmetric cylindrical constructions on base-graphs admitting commutative decompositions behave as generalized tensor products. We compute the characteristic polynomial of such symmetric cylindrical constructions in terms of the spectra of the base-graph and the cylinders in a general setting. This gives rise to a simultaneous generalization of some well-known results on the spectra of a variety of graph amalgams, as various graph products, graph subdivisions and generalized Petersen graph constructions. While our main result introduces a connection between spectral graph theory and commutative decompositions of graphs, we focus on commutative cyclic decompositions of complete graphs and tree-cylinders along with a subtle group labeling of trees to introduce a class of highly symmetric graphs containing the Petersen and the Coxeter graphs. Also, using techniques based on recursive polynomials we compute the characteristic polynomials of these highly symmetric graphs as an application of our main result. 相似文献
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A. G. Zavadskii 《Mathematical Notes》1973,13(2):196-201
The paper describes orders all of whose representations are completely decomposable, lying in a matrix algebra over the quotient field of a complete local Dedekind ring. For Morita-reduced orders an isomorphism criterion is provided in terms of the lattices of irreducible modules.Translated from Matematicheskie Zametki, Vol. 13, No. 2, pp. 325–335, February, 1973.The author wishes to thank V. V. Kirichenko, and also the participants in the Kiev seminar on representation theory, for their constant attention as well as for a host of valuable suggestions. 相似文献
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§ 1.Introduction Consider the nonlinear ODE with two parametersut+ g(u,λ,α) =0 (1 .1 )and its steady-state equationg(u,λ,α) =0 , (1 .2 )where g:U× R2 → U is a sufficiently smooth nonlinear mapping,and U a finitedimensional Hilbertspace.We remark thatitis easy to generalize ourresults to the casewhere g:U×R2→ V and U and V are infinite dimensional Hilbert spaces.So(1 .1 ) canbe e.g. a PDE. We assume that g is O(2 ) symmetric (equivalent,commutable) ,thatisγg(u,λ,α) =g(γu,… 相似文献
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Denote by SFin(v) the set of all integer pairs (t, s) for which there exist three symmetric Latin squares of order v on the same set having fine structure (t, s). We completely determine the set SFin(2n) for any integer n ≥ 5. 相似文献
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李三系是从黎曼对称空间产生的三元运算的代数系统,近年来备受数学家们的重视.针对李三系的Frattini子系和基本李三系的问题进行了研究,给出了Frattini子系和基本李三系的一些性质,并证明了李三系的非嵌入定理,同时得到了幂零李三系是基本李三系的一个充要条件. 相似文献
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For Lie triple systems in the characteristic zero setting, we obtain by means of the Killing forms two criterions for semisimplicity and for solvability respectively, and then investigate the relationship among the Killing forms of a real Lie triple system To, the complexification T of To, and the realification of T. 相似文献
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A triple cyclically contains the ordered pairs , , , and no others. A Mendelsohn triple system of order v, or , is a set V together with a collection of ordered triples of distinct elements from V, such that and each ordered pair with is cyclically contained in exactly λ ordered triples. By means of a computer search, we classify all Mendelsohn triple systems of order 13 with ; there are 6 855 400 653 equivalence classes of such systems. 相似文献
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Mariusz Meszka 《组合设计杂志》2013,21(11):531-540
We prove that, for even m, the chromatic index of the projective triple system STS( equals . 相似文献
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We consider a family of schemes, that are defined by minors of a homogeneous symmetric matrix with polynomial entries. We assume that they have maximal possible codimension, given the size of the matrix and of the minors that define them. We show that these schemes are G-bilinked to a linear variety of the same dimension. In particular, they can be obtained from a linear variety by a finite sequence of ascending G-biliaisons on some determinantal schemes. We describe the biliaisons explicitly in the proof of Theorem 2.3. In particular, it follows that these schemes are glicci. 相似文献
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Jean Ludwig 《Journal of Functional Analysis》1979,31(2):187-194
It is shown that connected groups of polynomial growth and compact extensions of nilpotent group have symmetric group algebras and that the group algebras of discrete solvable groups have the Wiener property. 相似文献
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有限维李三系称为二次的,如果它容许一个非退化的不变对称双线性型.无论是李三系分解为不可分解理想的直和,还是二次李三系分解为不可分解非退化理想的正交直和,证明了这两类分解在同构意义下都是唯一的. 相似文献
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Junyao Pan 《Journal of Pure and Applied Algebra》2018,222(2):291-296
For any with , then there exist such that , and . This is a conjecture of Stefan Kohl and which is closely related to problem on covers of the complex projective line. In this note we prove the conjecture is true. 相似文献