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- W2078294191 abstract "This paper is concerned with the system of ordinary linear differential equations with A (Z) (n:)-matrix of meromorphic functions in a neighborhood of the (isolated) singular point 0 and a column vector of dimension n. First we prove a new theorem about the reduction of such systems, by which a generally known result of J. Moser [12] from 1960 is essentially improved. With the help of a method from H. L. Turrittin [13], which was extended by us, this result finally leads to a lower bound for the reduction. Then according to our former result [7] this is also a lower bound for the maximum order ρmax of a fundamental solution matrix: ρmax ≥(1/n)δ(A). The quantity δ(A) is the limit of a sequence of quantities which characterize the singular behavior in z = 0. We will show that δ(A) is an invariant and that δ(A) = 0 holds if and only if the system is regular singular in z = 0. At the end of the paper the results will be applied to ordinary linear differential equations." @default.
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- W2078294191 date "1984-01-01" @default.
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- W2078294191 title "Über reduzierbarkeit und maximale ordnung bei linearen differentialgleichungssystemen" @default.
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- W2078294191 doi "https://doi.org/10.1080/17476938408814055" @default.
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