共查询到20条相似文献,搜索用时 46 毫秒
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The Gohberg–Semencul formula allows one to express the entries of the inverse of a Toeplitz matrix using only a few entries (the first row and the first column) of the inverse matrix, under some nonsingularity condition. In this paper we will provide a two variable generalization of the Gohberg–Semencul formula in the case of a nonsymmetric two-level Toeplitz matrix with a symbol of the form where and are stable polynomials of two variables. We also consider the case of operator valued two-level Toeplitz matrices. In addition, we propose an equation solver involving two-level Toeplitz matrices. Numerical results are included. 相似文献
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Let be an arbitrary integral domain, let be a multiset of elements of , let be a permutation of let be positive integers such that , and for let . We are interested in the problem of finding a block matrix with spectrum and such that for . Cravo and Silva completely characterized the existence of such a matrix when is a field. In this work we construct a solution matrix that solves the problem when is an integral domain with two exceptions: (i) ; (ii) , and for some .What makes this work quite unique in this area is that we consider the problem over the more general algebraic structure of integral domains, which includes the important case of integers. Furthermore, we provide an explicit and easy to implement finite step algorithm that constructs an specific solution matrix (we point out that Cravo and Silva’s proof is not constructive). 相似文献
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Multifractal formalisms hold for certain classes of atomless measures μ obtained as limits of multiplicative processes. This naturally leads us to ask whether non trivial discontinuous measures obey such formalisms. This is the case for a new kind of measures, whose construction combines additive and multiplicative chaos. This class is defined by ( integer ). Under suitable assumptions on the initial measure μ, obeys some multifractal formalisms. Its Hausdorff multifractal spectrum is composed of a linear part for h smaller than a critical value , and then of a concave part when . The same properties hold for the Hausdorff spectrum of some function series constructed according to the same scheme as . These phenomena are the consequences of new results relating ubiquitous systems to the distribution of the mass of μ. To cite this article: J. Barral, S. Seuret, C. R. Acad. Sci. Paris, Ser. I 339 (2004). 相似文献
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Xiongping Dai Yu Huang Jun Liu Mingqing Xiao 《Linear algebra and its applications》2012,437(7):1548-1561
We study the finite-step realizability of the joint/generalized spectral radius of a pair of real square matrices and , one of which has rank 1, where . Let denote the spectral radius of a square matrix A. Then we prove that there always exists a finite-length word , for some finite , such thatIn other words, there holds the spectral finiteness property for . Explicit formula for computation of the joint spectral radius is derived. This implies that the stability of the switched system induced by is algorithmically decidable in this case. 相似文献
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Abdallah Derbal 《Comptes Rendus Mathematique》2005,340(4):255-258
Let the functions and be number of unitary divisors (see below) and number of divisors n in arithmetic progressions ; k and l are integers relatively prime such that and let, for where is Euler's totient. The function has been studied in [A. Derbal, A. Smati, C. A. Acad. Sci. Paris, Ser. I 339 (2004) 87–90]. In this Note we study the functions and . We give explicitly their maximal orders and we compute effectively the maximum of for and that of for . To cite this article: A. Derbal, C. R. Acad. Sci. Paris, Ser. I 340 (2005). 相似文献
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Masatoshi Fujii Ritsuo Nakamoto Keisuke Yonezawa 《Linear algebra and its applications》2013,438(4):1580-1586
The grand Furuta inequality has the following satellite (SGF;), given as a mean theoretic expression:where is the -geometric mean and () is a formal extension of . It is shown that (SGF; ) has the Löwner–Heinz property, i.e. (SGF; ) implies (SGF;t) for every . Furthermore, we show that a recent further extension of (GFI) by Furuta himself has also the Löwner–Heinz property. 相似文献