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- W2898458054 abstract "A matrix is called strictly sign-regular of order $k$ (denoted by $SSR_k$) if all its $ktimes k$ minors are non-zero and have the same sign. For example, totally positive matrices, i.e., matrices with all minors positive, are $SSR_k$ for all $k$. Another important subclass are those that are $SSR_k$ for all odd $k$. Such matrices have interesting sign variation diminishing properties, and it has been recently shown that they play an important role in the analysis of certain nonlinear cooperative dynamical systems. In this paper, the spectral properties of nonsingular matrices that are $SSR_k$ for a specific value $k$ are studied. One of the results is that the product of the first $k$ eigenvalues is real and of the same sign as the $ktimes k$ minors, and that linear combinations of certain eigenvectors have specific sign patterns. It is then shown how known results for matrices that are $SSR_k$ for several values of $k$ can be derived from these spectral properties. Using these theoretical results, the notion of a totally positive discrete-time system (TPDTS) is introduced. This may be regarded as the discrete-time analogue of the important notion of a totally positive differential system, introduced by Schwarz in 1970. The asymptotic behavior of time-invariant and time-varying TPDTSs is analyzed, and it is shown that every trajectory of a periodic time-varying TPDTS converges to a periodic solution." @default.
- W2898458054 created "2018-11-02" @default.
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- W2898458054 date "2018-10-26" @default.
- W2898458054 modified "2023-09-27" @default.
- W2898458054 title "On the spectral properties of nonsingular matrices that are strictly sign-regular for some order with applications to totally positive discrete-time systems" @default.
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