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N.A. Izobov, S.A. Mazanik (2006)
On Asymptotically Equivalent Linear Systems under Exponentially Decaying PerturbationsDiffer. Uravn., 42
R. Horn, Charles Johnson (1985)
Matrix analysis
N.A. Izobov, S.A. Mazanik (2007)
A General Test for the Reducibility of Linear Differential Systems, and the Properties of the Reducibility CoefficientDiffer. Uravn., 43
N. Izobov, S. Mazanik (2007)
A general test for the reducibility of linear differential systems and properties of the reducibility coefficientDifferential Equations, 43
The paper [2] defines the noncoinciding irreducibility sets N 2(a, σ) and N 3(a, σ), σ ∈ (0, 2a], of all n-dimensional linear differential systems with piecewise continuous coefficient matrices A(t) such that ‖A(t)‖ ≤ a < + ∞ for t ∈ [0,+∞) and there exists a linear differential system that is not Lyapunov reducible to the original system and has coefficient matrix B(t) satisfying [for the case of N 2(a, σ)] the condition $\left\| {B(t) - A(t)} \right\| \leqslant const \times e^{ - \sigma t} ,t \geqslant 0,$ or [for the case of N 3(a, σ)] the more general condition that the Lyapunov exponent of the difference B(t) − A(t) does not exceed −σ. For these sets, which are related by the obvious inclusions $N_i (a,\sigma _1 ) \supseteq N_i (a,\sigma _2 ),0 < \sigma _1 < \sigma _2 \leqslant 2a,i = 2,3,$ , we prove that (i) they strictly decrease with increasing parameter σ ∈ (0, 2a], N i (a, σ 1) ⊃ N i (a, σ 2) for σ 1 < σ 2; (ii) there is a strict inclusion N 2(a, σ) ⊂ N 3(a, σ) for all σ ∈ (0, 2a].
Differential Equations – Springer Journals
Published: Feb 5, 2012
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