Criterion for the reducibility in the mean of linear differential systemsстатья
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Аннотация:A criterion (in terms of the singular numbers of Cauchy operators) is obtained for the reducibility in the mean, i.e., for the approximability (in the mean, on a half-line), of a given system to any degree of accuracy by means of Lyapunov transformations of another given system. It is proved that any two triangular systems with identical diagonals are reducible in the mean to each other.